J. A. Wheeler obtained these postcards and letters from Ehrenfest's widow, Tatiana Ehrenfest-Afanassjewa, and had them microfilmed without regard for chronological order. A list of datelines, in the sequence in which the materials were photographed, has been placed at the beginning of the microfilm. For a chronological listing see the "Einstein" article in Chapter II. The materials are, at present, held with the Einstein Collection at the Institute for Advanced Study, Princeton, New Jersey.

Letters, postcards and telegrams from A. Einstein to P. Ehrenfest (77/155 in 1915-33).

These materials were uncovered by A. Landé in Columbus, Ohio, on returning from project interviews in Berkeley and were received in May, 1962. In accordance with his instructions, they were deposited at the Niels Bohr Library of the American Institute of Physics in New York City.

Microfilm 4. A. Landé Correspondence, I

Section 1.

Letters to A. Landé from N. Bohr (12/30 in 1919-25).

Section 2.

Letters to A. Landé from M. Born (20/59 in 1918-24).

Section 3.

Letters to A. Landé from P. Ehrenfest (6/10 in 1922-26).

Section 4.

Letters to A. Landé from E. Fues (7/10in 1924-27)

Section 5.

Letters to A. Landé from W. Gerlach (8/16 in 1923-24)

Section 8.

Letters to A. Landé from H. Konen (7/8 in 1923-27)

Section 9.

Letters to A. Landé from F. London (11/20 in 1924-27)

Section 10.

Letters to A. Landé from E. Madelung (8/11 in 1919-25)

Section 11.

Letters to A. Landé from F. Paschen (14/27 in 1920-27).

Section 12.

Letters to A. Landé from W. Pauli (22/68 in 1921-26).

Section 13.

Letters to A. Landé from A. Sommerfeld (20/61 in 1915-24).

Section 14.

Letters to A. Landé from P. Zeeman (6/12 in 1921-25).

Section 15.

Letters to A. Landé from: E. Back (4/11 in 1921-22); H. Baerwald [?] (1/1 in 1920); W. H. van der Sande Bakhuissen (2/3 in 1921-24); A. H. Bucherer (1/2 in 1926); J. M. Burgers (1/1 in 1919); H. C. Burger (1/1 in 1924); O. Chwolson (1/1 in 1923); A. Correlli (2/3 in 1926); K. K. Darrow (2/2 in 1925-26); A. Einstein (1/1 in 1924); P. Epstein (4/9 in 1921-23); P. Ewald (1/1 in 1921).

Section 16.

Letters to A. Landé from: K. Fajans (2/3 in 1920); A. Fokker (2/3 in 1921); A. Fowler (1/2 in 1924); J. Franck (2/3 in 1919-20); B. Freundlich (113 in 1919); R. Glocker (5/10 in 1920-21); W. Gordon (1/4 in 1923); W. Grotrian (3/8 in 1923-24).

Section 17.

Letters to A. Landé from: W. Heitler (1/1 in 1927); F. Henning (1/1 in 1926); G. Hertz (3/5 in 1924-25); P. Hertz (3/5 in 1915-24); W. M. Hicks (1/1 in 1925); A. Johnsen (1/2 in 1919); G. Joos (1/2 in 1925); W. Kaufmann (315 in 1919-22); J. Königsberger (1/1 in 1920); H. A. Kramers (1/1 in 1921); R. Kronig (2/4 in 1925).

Section 18.

Letters to A. Landé from: R. Ladenburg (2/3 in 1920); K. Lanczos (1/4 in 1926); I. Langmuir (2/4 in 1920-21); G. Laski (1/2 in 1920); R. Lorenz (3/7 in 1923); A., Magnus (2/4 in 1922); E. Mecke (1); W. Meissner (1/1 in 1925); G. Mie (3/6 in 1925).

Section 19.

Letters to A. Landé from: H. Nagaoka (2/2 in 1922-24); L. Natansona (1/4 in 1925); L. S. Ornstein (4/5 in 1923-24); R. Ortvay (1/3 in 1920); M. Planck (1/3 in 1926); P. Pringsheim (1/1 in 1924); F. Reiche (1/2 in 1919); H. Reichenbach (2/3 in 1924-26); A. Ruark (1/2 in 1924); C. Runge (1/2 in 1924); P. Scherrer (1 in 1919).

Section 20.

Letters to A. Landé from: A. Schoenflies (1/2 in 1919); E. Schr8dinger (3/6 in 192526); L. A. Sommer (3/4 in 1923-25); O. Stem (2/3 in 1919-23); E. Stoner (1/1 in 1924).

Section 21.

Letters to A. Landé from: T. Takamine (3/4 in 1921-25); H. Thirring (3/5 in 1920-26); J. D. van der Waals (1/1 in 1924); J. H. Van Vleck (2/4 in 1922-24); G. Varga (1/1 in 1915); G. Wentzel (1/1 in 1924).

Microfilm 6. A. Landé Correspondence, II

Section 1.

Letters to A. Landé from S. Goudsmit (13/31 in 1923-27).

Section 2.

Letters to A. Landé from W. Heisenberg (37/164 in 1921-25).

The following correspondence and manuscripts were obtained by L. Rosenfeld from H. A. Kramers' daughter, Miss Martien Kramers, Heerenstraat 16A, The Hague, The Netherlands. Brought to the Bohr Sekretariat in 1962, the correspondence was arranged by Fru E. Tanggaard under Rosenfeld's supervision and, subsequently, catalogued and microfilmed by Sources for History of Quantum Physics. This material remains at the Institute for Theoretical Physics, Copenhagen, Denmark, pending final arrangements. Additional Kramers material is described below (Microfilms 25-28).

Microfilm 8. H. A. Kramers Correspondence to 1926

Section 1.

Letters to H. A. Kramers from: E. Abrahamsen (1/1 in 1924); H. K. to E. Abrahamsen (1/1 in 1924); H. K. to D. Andersen (1/1 in 1925); Akad. Verlag (1/1 in 1924); S. Arrhenius (1/3 in 1920); T. E. Aurén (1/2 in 1925); F. Arndt (12/21 in 1924-25); H. K. to F. Arndt (2/4 in 1924).

Section 2.

Letters to H. A. Kramers from: Die Umschau (1/1 in 1924); H. K. to R. Becker (1/3 in 1924); R. Becker (3/5 in 1924-25); H. Bell (1/2 in 1924); A. Berliner (2/2 in 1924); H. K. to A. Berliner (2/3 in 1924-25); Kong. Danske Gen. Konsulat to M. Born (1/1 in 1925); H. K. to M. Born (1/2 in 1925); M. Born (2/2 in 1925); Hede Born (1/2 in 1925); G. Breit (1/3 in 1924); N. Bohr (3/8 in 1921-24).

Section 3.

Letters to H. A. Kramers from: W. Colby (2/3 in 1924-25); L. Darmstaedter (1/2 in 1924); H. K. to Defant (1/1 in 1924); Dolejsek (1/2 in 1922); G. Eberhard (1/2 in 1924); H. K. to A. S. Eddington (1/2 in 1923); A. S. Eddington (1/2 in 1923).

Section 4.

Letters to H. A. Krainers from D. Coster (37/100 in 1916-25).

Section 5.

Letters to H. A. Kramers from: P. Ehrenfest (20/53 in 1915-25); G. H. Reerink (1/5 in 1924).

Section 6.

Letters to H. A. Kramers from: H. Faxén (4/8 in 1924); H. K. to R. H. Fowler (1/2 in 1925); R. H. Fowler (5/10 in 1925); J. Franck (1/2 in 1924); H. K. to J. Franck (1/2 in 1924); Gjentofte Kommune (1/1 in 1924); G. Ragoczy's Buchhandl. (2/3 in 1924); H. K. to Grüneberg's Buchhandl. (1/1 in 1924); H. K. to O. Halpern (1/1 in 1924), Unidentified to Unidentified (1/1); W. Hanle (1/2 in 1925); W. Heisenberg (1/4 in 1925); G. Hertz (1/1 in 1925); G. Hettner (1/1 in 1924); G. de Hevesy (1/2 in 1924); H. Holst (3/8 in 1921-25); H. K. to A. L. Hughes (1/2 in 1924); A. L. Hughes (2/4 in 1924).

Section 7.

Letters to H. A. Kramers from: A. D. Fokker (13/26 in 1920-25); H. K. to Intl. Crit. Tables (2/5 in 1925); Intl. Crit. -Tables (6/8 in 1924-25); J. Jensen (1/1 in 1925); E. R. Jette (2/4 in 1924); W. P. Jonin [?] (2/4 in 1924); F. M. Jaeger (2/5 in 1924-25); A. V. Jorgensen (2/2 in 1924); W. Keesom (1/1 in 1924); E. C. Kemble (1/1 in 1925); O. Klein (5/12 in 1920-24); H. Kneser (1/2 in 1925); Certificate of residence in Denmark, 1924, 1 p.; Kronfeld (1/1 in 1924); R. Kronig (1/6 in 1924); H. K. to R. Kronig (1/2 in 1924).

Section 8.

Letters to H. A. Kramers from: A. Landé (1/2 in 1924); M. v. Lane (1/2 in 1925); M. v. Laue's review of Krainers' and Holst's The Atom and the Bohr Theory of its Structure, 3 pp.; H. K to Lecher (1/1 in 1924); Lecher (1/1 in 1924); H. K. to W. Lenz (1/1 in 1924); R. B. Lindsay (1/2 in 1923); Oliver Lodge (1/1 in 1924); M. Maar (1/2 in 1924); H. K. to Nature (2/4 in 1924); Nature (1/1 in 1924); H. K. to Naturfor. Versamm. (1/1 in 1924); Naturfor. Versamm. (5/17 in 1924); A. B. W. Nielsen (2/2 in 1925); Y. Nishina (1/2 in 1923); Knud Nissen to H. M. Hansen (1/3 in 1925); G. Nordström (2/5 in 1922); E. Oosterhuis (1/2 in 1923).

Section 9.

Letters to H. A. Kramers from: R. Ladenburg (10/20 in 1923-25); H. K. to R. Ladenburg (3/6 in 1924); H. K. to Panner (1/1 in 1924); Panner [?] (1/1 in 1924); W. Pauli (2/8 in 1923-25); Physica (1/1 in 1924); H. K. to Physica (1/1); Poggendorff-Bilro (1/6 in 1925); J. Ramböll (1/2 in 1924); H. K. to J. Ramböll (1/1 in 1924); H. K. to H. M. Randall (1/1 in 1924); H. M. Randall (1/2 in 1924); H. K. to Rask-Oerstedfondet (1/2 in 1923); Rask-Oerstedfondet (1/1 in 1924); Statens Laererhoeiskole (1/2 in 1924); F. Reiche (3/18 in 1923-24); H. K. to Riga U. (1/1 in 1923); S. Rosseland to D. Coster (1/1 in 1922); S. Rosseland (1/4 in 1925); A. Rubinowicz (1/2 in 1922); C. Runge (1/2 in 1923); H. K. to E. Rutherford (1/1 in 1923).

Section 10.

Letters to H. A. Kramers from: Saar [to H. and S. Kramers] (1/2 in 1925); K. Scheel (2/2 in 1924-25); H. K. to K. Scheel (2/3 in 1924); E. Schrödinger (1/2 in 1921); Scientia (1/1 in 1922); H. A. Senftleben (2/6 in 1924-25); H. K. to M. Siegbahn (1/2 in 1925); M. Siegbahn (2/4 in 1925); J. C. Slater (1/2 in 1923); A. Smekal (3/9 in 1919-21); D. Struik (1/2 in 1921); T. Takamine (2/9 in 1921-24); De Telegraaf (1/2 in 1924); Teubner [Kultur der Gegenwart] (8/17 in 1924-25); H. K. to Teubner (1/2 in 1924); H. Thirring [Handbuch der Physik] (1/3 in 1925).

Section 11.

Letters to H. A. Kramers from: A. Sommerfeld (3/6 in 1924); H. K. to A. Sommerfeid (3/6 in 1924); Springer [Verlag] (18/38 in 1924-25); H. K. to Springer (5/8 in 1924).

Section 12.

Letters to H. A. Kramers from: Undervisningsministeriet (3/5 in 1924-25); H. K. to H. C. Urey (1/5 in 1925); H. C. Urey (1/2 in 1924); A. Walther (1/2 in [1921]); H. K to D. L. Webster (1/3 in 1924); D. L. Webster (2/3 in 1924); F. Weigert [?] (1/2 in 1924); S. Werner (4/9 in 1922-25); H. Vestesen [Fabrikant] (1/3 in 1924); H. K. to H. Vestesen (2/3 in 1923); H. K. to J. H. Van Vleck (1/3 in 1924); J. H. Van Vleck (1/3 in 1924); Guido Voghera (1/1 in 1924).

Microfilm 9. H. A. Kramers Correspondence, 1926-39, A-F

Section 1.

Letters to H. A. Kramers from: Akad. Verlag (2/3 in 1936-38); W. van den Ber (1/2 in 1937); H. Bhabha (2/6 in 1937); C. Bialoblecki (1/6 in 1937); A. Bijl (1/2 in 1937); F. Bloch (1/2 in 1938); H. C. Brinkman (2/4 in 1937-38); E. F. Burton (2/4 in 1936-38).

Section 2.

Letters to H. A. Kramers from J. Becquerel (60/242 in 1930-39); H. K., Notes on paramagnetism, 2 pp.

Section 3.

J. Becquerel: MS, "Théorie du métamagnétisme."

Section 4.

Letters to H. A. Kramers from: F. J. Belinfante, Calculations on aa* - a*a, 4 pp.; H. K., Comments on Belinfante's calculations, 1 p.; F. Belinfante (6/10 in 1937-39).

Section 5.

Letters to H. A. Kramers from N. Bohr (11/18 in 1926-39); P. Dirac to N. Bohr (1/2 in 1929); N. Bohr to P. Dirac (1/4 in 1929).

Section 6.

Letters to H. A. Kramers from: Cass [?] (1/2); E. Carb [?], U. Leiden, Psychiatric Clinic (1/2 in 1938); Cong. Intl. d. Fis. (113 in (1927]); J. A. Christiansen (1/7 in 1937); Guild of All Arts (1/2 in 1939); J. Clay (2/6 in 1937); H. K. to W. Colby (2/4 in 1927); W. Colby (2/4 in 1928); H. K., Notes on nuclear fission, 2 pp.; A. Cotton (1/4 in 1935).

Section 7.

Letters to H. A. Kramers from D. Coster (9/17 in 1919-39); H. K. to Dirk [Coster] (1/2 in 1938).

Section 8.

Letters to H. A. Kramers from: Dansk Samfund i Holland (1/14 in 1936-39); P. Debye (1/1 in 1938); M. Delbrück (1/2 in 1936); G. Dieke (6/14 in 1938-39); Jesse Dumond (1/2 in 1937).

Section 9.

Letters to H. A. Kramers from: Ludwig Ebert (1/2 in 1927); W. Grotrian to Edlén [?] (1/1 in 1937); Ehlerman [?] (1/1 in 1938-39); Intl. Inst. of Intellectual Coop. (1/1 in 1938-39) A. Eucken (3/6 in 1937-38).

Section 10.

Letters to H. A. Kramers from: P. Ehrenfest (10/15 in 1926-31); U. Leiden (1/2 in 1938).

Section 11.

Letters to H. A. Kramers from: Sara Flanders (1/2 in 1938); O. R. Frisch (1/2 in 1938); H. Fröhlich (1/2 in 1937).

Section 12.

Letters to H. A. Kramers from A. D. Fokker (7/10 in 1926-29).

Microfilm 10. H. A. Kramers Correspondence, 1926-39, G-Z

Section 1.

Letters to H. A. Kramers from: M. K. Ghosh (1/2 in 1938); W. Gordon (1/2 in 1933); S. Goudsmit (1/2 in 1939); V. Govers (4/9 in 1931-37); Groen [?] (10/20 in 1937-39); F. Gulbis [Riga U.] (1/2 in 1939).

Section 2.

Letters to H. A. Kratners from C. Gorter (9/18 in 1930-33).

Section 3.

Letters to H. A. Kramers from: van't Haaff (1/1 in 1937); W. J. de Haas (2/3 in 1933-39); W. Heisenberg (4/5 in 1935-39); W. Heitler (1/3 in 1937); G. Heller (1/2 in 1938); P. H. Hermans (1/2 in 1938); Kramers, Notes on wave mechanics of the tensile strength of a linear molecule, 3 pp.; I. Hertzsprung (1/2 in 1932); H. Hoek (4/9 in 1939).

Section 4.

Letters to H. A. Kramers from L. Hulthén (8/22 in 1936-39).

Section 5.

Letters to H. A. Kramers from: H. K. to Joliot (113 in 1930); A. de Jong [Machinefabriek] (1/1 in 1938); A. Keesing (1/2 in 1937); W. H. Keesom (4/5 in 1934-38); C. J. van der Klaauw (2/2 in 1936-39); O. Klein (4/7 in 1936-38); T. Koopmans to R. Frisch [in Oslo] (1/6 in 1936-39); T. Koopmans (3/6 in 1936); W. Kuhn (115 in 1939).

Section 6.

Letters to H. A. Kramers from: H. K. to R. de L. Kronig (117 in 1926); R. de L. Kronig (7/28 in 1926-38).

Section 7.

Letters to H. A. Kramers from: Kratners, Notes on Langevin's article on kinetic theory in Ann. de Chim. et de Phys, I p.; M. Léauté (1/2 in 1937); H. A. Lorentz (1/3 in 1927); Lowry [per I. K. Allsopp] (1/1 in 1936); Lijkverbranding, Facultatieve (1/8 in 1939); H. Mark (2/2 in 1937); L. Matant [?] (113 in 1931); St. Michalski [Organon] (113 in 1938); N. F. Mott (3/8 in 1937-39).

Section 8.

Letters to H. A. Kramers from: Kramers, Outline for article on "X-rays and Wave Mechanics," 1 p.; Current Science (3/5 in 1936); Kramers, Notes for a talk [?] on "Lichtgolven en Lichtquanta," 2 pp.; O. Neugebauer (1/1 in 1939); Y. Nishina (2/4 in 1927); J. Dalla Noce (315 in 1937-38).

Section 9.

Letters to H. A. Kramers from: L. Onsager (1/8 in 1935); R. Oort (1/2 in 1937); W. Opechobski (8/18 in 1935-39); L. S. Ornstein (4/4 in 1936-39).

Section 10.

Letters to H. A. Kramers from: A. Pais (1/1 in 1939); Pannekoek (1/1 in 1938); W. Pauli (1/6 in 1926); R. Peierls (1/1 in 1939); W. van Peijpe (1/2 in 1926); Mogens Pihl (1/2 in 1939); H. M. Randall (1/1 in 1938); A. Rubinowicz (3/4 in 1929-39); H. K. to A. Rubinowicz (1/1 in 1939); L. Rutten [?], [mineralogist, Utrecht] (2/4 in 1926-37).

Section 11.

Letters to H. A. Kramers from A. J. Rutgers (10131 in 1937).

Section 12.

Letters to H. A. Kramers from: S. Sambursky (1/2 in 1937); J. F. Schuh (1/2 in 1939); J. Serpe (3/4 in 1939); W. W. Sleator (1/2); H. K. to A. Smits (1/1 in 1938); A. Smits, Inorganic Laboratory, U. Amsterdam (2/6 in 1938); J. L. Snoek (1/2 in 1937); J. L. Snoek to van Peijpe (1/1 in 1938); Institut Intl. de Physique Solvay (1/2 in 1939); A. Sommerfeld (2/4 in 1937-39); J. C. v. Staweren [?] (115 in 1932); M. H. Stobbe (3/5 in 1937); F. Süffert [Naturwiss.] (1/1 in 1938).

Section 13.

Letters to H. A. Kramers from: Academic Assistance Council (1/1 in 1936); A. Siegert (6/21 in 1936-38).

Section 14.

Letters to H. A. Kramers from: T. Takamine (1/2 in 1937); G. Uhlenbeck (2/4 in 1937 [?]); H. C. Urey (1/1 in 1938); J. H. van Vleck to Jean Becquerel (1/2 in 1934); J. H. van Vleck (4/6 in 1934-39); J. A. Vollgiatt [?] (1/2 in 1938).

Section 15.

Letters to H. A. Kramers from: J. D. van der Waals, Jr. (1/2 in 1939); G. Wannier (8/10 in 1939); Pierre Weiss (3/7 in 1939); V. Weisskopf (1/2 in [ 1939] H. K. to V. Weisskopf (1/1 in 1939); van de Well (1/2 in 1939); E. C. Wiersma (1/2); W. R. van Wijk (1/1 in 1937); C. Zimmermann, Natuurkundig Gezelschap, Middelburg (1/1 in 1939); P. A. v. Zutphen (1/1 in 1938).

Microfilm 11. H. A. Kramers Correspondence, 1940-52, A-D

Section 1.

Letters to H. A. Kramers from: V. Aerts (1/5); Akad. Verlag (3/3 in 1941); Alg. Nederl. Persbureau (1/1 in 1951); J. F. Allen (2/2 in 1949); E. Amaldi (2/2 in 1951); Ambassade van het Koninkrijk der Nederl. (3/6 in 1948); Amer. Ass. for the Advancement of Science (5/6 in 1948); Nederl. Informatie Bureau (1/2 in 1947).

Section 2.

Letters to H. A. Kramers from: R. F. Bacher (2/2 in 1949); Baetherlaer, Min. van Buitenlandsche Zaken (1/1 in 1947); C. J. Bakker (1/1 in 1948); S. J. Barnett (1/1 in 1941); Bartling, Alg. Nederl. Vereen. voor Wijsbegeerte (1/2 in 1947); Baruch, U. S. Embassy, The Hague (1/1 in 1949); Bataafsch Genootschap der Proefonder vindelijke Wijsbegeerte (1/1 in 1941); J. H. Rijks, Bataafsche Petroleum Maatschappij (9/11 in 1944); Edmond Bauer (1/2 in 1951); Fried. L. Bauer (2/2 in 1951); R. Becker (3/3 in 1947); E. G. Begle (1/1 in 1950); Académie Royale de Belgique (1/1 in 1946); Lewis E. Berg (1/4 in 1946); J. E. van den Bergh (1/4 in 1947); E. D. Bergmann (1/1 in 1951); H. Bhabha (2/5 in 1950).

Section 3.

Letters to H. A. Kramers from: C. B. Biezeno (1/7 in 1941); E. Bodewig (1/2 in 1948); Jan de Boer (5/12 in 1944-47); C. J. F. Böttcher (4/7 in 1945); Bolhestein [?] (1/1 in 1941); Max Born (2/3 in 1945-[51]); O. Bottema, Delftsch Hoogeschoolfonds Hoogeschoolraad (1/1 in 1949); G. Boutry (1/1 in 1951); Bremchamp [?] (1/1 in 1945); F. G. Brickwedde (1/1 in 1946); Jae Bruyz [?] (1/2 in 1943); Hajo Bruining (1/2 in 1947); C. Brinkelman (4/12 in 1950); Bruynzeel's Vloeren-fabriek (1/2 in 1944).

Section 4.

Letters to H. A. Kramers from Jean Becquerel (15137 in 1941-51); H. K. to Jean Becquerel (1/2 in [1941]).

Section 5.

Letters to H. A. Kramers from F. Belinfante (15/40 in 1940-50).

Section 6.

Letters to H. A. Kramers from D. Bijl (8/19 in 1945-51).

Section 7.

Letters to H. A. Kramers from N. Bohr (20/26 in 1942-52).

Section 8.

Letters to H. A. Kramers from: J. Burgers (3/9 in 1940-43); K. Blokhuis (1/2 in 1940); J. Burgers to K. Blokhuis (1/2 in 1940).

Section 9.

Letters to H. A. Kramers from: W. L. Bragg (7/16 in 1946-50); van den Dungen, Inst. Solvay (1/2 in 1948); E. Orowan to W. L. Bragg (1/2 in 1950); N. F. Mott to W. L. Bragg (1/1 in [1950]).

Section 10.

Letters to H. A. Kramers from H. D. Brinkman (15/55 in 1940-52); P. v. d. Leeden to H. C. Brinkman (113 in 1948).

Section 11.

Letters to H. A. Kramers from S. M. Bruins (4/15 in 1941-44).

Section 12.

Letters to H. A. Kramers from: H. Casimir (1/1); D. B. Centen's Uitgevers Maatschappij 2/2 in 1944); J. Chadwick (1/2 in 1951); J. A. Christiansen (1/3 in 1948); J. D. Cockcroft (7/7 in 1948-51); Walter Colby (1/2 in [1923]); A. Comble [?] (1/2); Richard Courant (11/15 in 1950); J. Custers (1/3 in 1951).

Section 13.

Letters to H. A. Kramers from J. Clay (10/21 in 1946-48).

Section 14.

Letters to H. A. Kratners from Dirk Coster (18/33 in 1940-50).

Section 15.

Letters to H. A. Kramers from: Dansk Samfund i Holland (1/1 in 1944); Bergen Davis (2/3 in 1947); K. K. Darrow (5/7 in 1947-50); A. H. C. Denier van der Gon (3/7 in 1949); E. J. Dijksterhuis (4/5 in 1952); S. Doerchale [?] (1/2 in 1944); H. Dorgelo (1/2 in 1944); M. J. Druyrestyn (1/1 in 1947); H. K. to M. J. Druyrestyn (1/1 in 1947); L. A. DuBridge (2/3 in 1947); O. S. Duffendack to A. T. Waterman (1/2 in 1946); U. S. Immigration Service (1/1 in 1946); J. R. Dunning (2/2 in 1947); K. Durant (1/2 in 1946); K. v. Duuren (1/1 in 1944-45); Van Dyck (1/4 in 1942).

Microfilm 12. H. A. Kramers Correspondence, 1940-52, E-L

Section 1.

Letters to H. A. Kramers from: Edlen (3/4 in 1946-47); Leonard Elion (1/1 in 1947); Elsevier Publ. Co. (1/2 in 1945); P. Emmelot (1/2 in 1945); J. J. Schilthuis, Amer. Enka Corp. (1/1 in 1947); P. S. Epstein (1/2 in 1948); Excelsior Uitgeverij (1/1 in 1951).

Section 2.

Letters to H. A. Kramers from: P. Feenstra-Kuiper (1/1 in 1947); Fleury [?] (1/2 in 1950); G. FoEx (2/2 in 1951); J. S. Foster (1/2 in 1924); Inst. de France (1/1 in 1947); H. Frauenfelder (3/6 in 1950); Natl. Fonds voor Wetenschappelijk Onderzoek, Interuniv. Inst. voor Kernphysica (1/1 in 1948); van Trislet, [?] van Loghum Slaterus' Uitgevers Maatschappij, (1/1 in 1948); R. Fürth (1/2 in 1946).

Section 3.

Letters to H. A. Kramers from A. D. Fokker (13/30 in 1942-51).

Section 4.

Letters to H. A. Kramers from: Geendert (4/6 in 1942-45); H. C. Janse (1/2 in 1945); A. N. Gerritsen (4/6 in 1946-47); R. C. Gibbs, Nat. Res. Council (1/1 in 1947); C. J. Gorter (3/8 in 1945-46); M. L. Gouweloos (1/1 in (1943]); Enrico Greppi (1/1 in 1949); Arthur W. Grey (1/1 in 1946); P. Groen (6/12 in 1940-42); W. de Groot (1/1 in 1951); Die Reichskommission für die besetzten Niederländischen Gebiete, der Generalkommissar für Finanz und Wirtschaft (1/1 in 1944); E. A. Guggenheim (1/2 in 1949); T. Gustafsen (4/6 in 1949-50); M. Günther [?] (2/2 in 1949).

Section 5.

Letters to H. A. Kramers from: J. A. Bierens de Haan, Hollandsche Maatschappij der Wetenschappen (1/1 in 1950); J. Haanbjes (2/4 in 1940); J. M. Hancock (1/1 in 1947); Jan Havelaar en Zoon, Makelaars in Assurantiën (2/2 in 1942-44); E. Havinga (1/1 in 195[?]); W. Heisenberg (7/12 in 1943-47).

Section 6.

Letters to H. A. Kramers from: G. Herzberg (2/3 in 1946-51); David L. Hill (1/2 in 1950); M. Hilsum (2/3 in 1943); F. R. Hirsh, Jr. (2/3 in 1950); D. J. Hofsomne (1/1 in 1947); Hollandsche Maatschappij der Wetenschappen, Reglement van het P. L. Lambertuszoon-Fonds (1/1); H. Holst (1/6 in 1945); Delft Hogeschool Fonds, J. G. Rutgers, G. Van Hevson, A. J. Neinhuis (11/17 in 1943-45); L. Hulthén (3/8 in 1942-50).

Section 7.

Letters to H. A. Kramers from P. van't Haaff (9/29 in 1944-49).

Section 8.

Letters to H. A. Kramers from: D. ter Haar (22/43 in 1946-52); Hubert M. James (1/1 in 1947).

Section 9.

Letters to H. A. Kramers from W. J. de Haas (11/22 in 1940-52).

Section 10.

Letters to H. A. Kramers from: K. Inniger (1/2); Inst. voor Intl. Zaken (1/2 in 1947); Inst. for Intl. Educ. (1/1 in [1947]); Kurt Jacoby, Academic Press (1/1 in 1951); M. J. Jansen, N. V. Philips' Laboratorium (1/1 in 1948); F. Joliot-Curie (1/3 in 1947); H. K. to F. Joliot-Curie (1/1 in 1947); C. M. J. de Jongh (1/1 in 1943); L. Jongkees [?], U. Kliniek (1/1 in 1947); C. C. Jonker (1/1 in 1950); P. D. Joustra (2/6 in 1943); Herman Julius (1/2 in 1945); P. L. Jacob (1/2 in 1942).

Section 11.

Letters to H. A. Kramers from Robert Jastrow (3/15 in 1947-50).

Section 12.

Letters to H. A. Kramers from: John Kager, Technisches Bureau (1/1 in 1947); Boris Kahn (3/3 in 1940-43); A. Kamminga (1/2 in 1945); George Karreman (4/32 in 1942-51); Robert Kastner (1/1 in 1950); H. K., Calculations regarding evaluation of two integrals in Kramers' paper on X-rays [Phil. Mag. (1923)]; Mrs. J. Rudolf Katz (1/2); A. Keesing (1/2 in 1943); J. Kistemaker (4/10 in 1945-46); D. de Klerk (1/1 in 1945); A. J. Kluwer (1/1 in 1951); G. Knie (1/2 in 1946); G. A. Kohnstamm to H. C. Brinkman (1/2 in 1946); S. Kooi, Genootschap voor Wetenschappelijke Philosophie (1/1 in 1949); Uitgever Kosmos (1/1 in 1947).

Section 13.

Letters to H. A. Kramers from: Louis Kramer, Cello Repairing (1/1 in 1947); Ralph Kronig (2/4 in 1945); M. Kruisinga, Notariste Vriezenveen (2/5 in 1943-49); J. J. Krusemeyer (1/2 in 1949); N. H. Kuiper (6/15 in 1946-50); W. v. d. Kulk (1/2 in 1947); J. D. Kurbator (1/2 in 1947); Ayao Kuwaki (1/1); Kobenhavns Universitetets Rektor (1/1 in 1943); H. K. to J. Norregaard, Rektor for Kobenhavns U. (1/1 in 1945).

Section 14.

Letters to H. A. Kramers from W. J. C. Kooper, Psycholoog (5/21 in 1944-45).

Section 15.

Letters to H. A. Kramers from J. Korringa (7/12 in 1943-51).

Section 16.

Letters to H. A. Kramers from: K. Lark-Horovitz (4/6 in 1947-50); M. v. Lane (2/2 in 1947); J. E. Lennard-Jones (1/4 in 1946); Samuel Levine (1/1 in 1946); Erica M. Lesk (1/1, in 1943); Benjamin Liebowitz (1/2,in 1949); G. A. W. Rutgers (1/2 in 1950); David Lilienthal (1/1); G. Lind (1/2 in 1944); H. K. to G. Lind (1/1 in 1944); H. Lindeman (3/5 in 1948-50); Jan W. Lindeman, Vioolbouwer (1/1 in 1951); A. E. Lindly (1/1 in 1947); Lindsay Light and Chemical Co. (1/4 in 1946-47); H. K. to Lindsay Light Co. (1/2 in 1947); R. B. Lindsay (3/4 in 1947-49) A. M. Bork (1/1 in 1949); Ashley H. Carter (1/1 in 1949); Lorentz-Medaille, Koninklike Nederl. Akad. van Wetenschappen (1/1 in 1947); Kommandierender General und Befehlshaber im Luftgau Holland (1/2 in 1943).

Section 17.

Letters to H. A. Kramers from J. T. Lubonski (10/20 in 1941-45).

Microfilm 13. H. A. Kramers Correspondence, 1940-.52, M-R

Section 1.

Letters to H. A. Kramers from: Majorana, Nuovo Cimento (1/1 in [1943]); Marees van Swinderen, Nederl. Genootschap voor Intl. Zaken (1/1 in 1946); Herman Mark (2/4 in 1947); Renato Martinette (1/2 in 1949); Men's Faculty Club, Columbia U. (1/1 in 1947); J. H. van der Merwe (2/5 in 1948); H. Meulenhoff, Uitgever (1/2 in 1945); L. Marton (1/2 in 1949); L. Meyer [?] (1/1 in 1947); Martin Meyer (1/1 in 1947); P. H. E. Meyer (1/2 in 1946); W. Nanta, Middendorp-YJoosters (1/3 in 1950); P. Minderaa (1/2 in 1945); M. Minnaert (1/2 in 1948); H. K. to M. Minnaert (1/4 in 1941); H. K., Errata to Mittard's book [?], 1 p.; L. Molendijk (3/12 in 1946); C. A. Mostert, Machtiging (2/2 in 1944); R. S. Mulliken (1/1 in 1948); G. F. W. Mulders (2/5 in 1947-48).

Section 2.

Letters to H. A. Kramers from: The Netherl. Information Bureau (1/2 in 1946); John von Neumann (1/1 in 1949); L. R. Nienstaedt [Economist] (5/18 in 1946-47); Nijhoff's Uitgeversmaatschappij (4/4 in 1944); S. Nikitine. U. Farouk I (1/1 in 1947); Nobelkommitté för Fysik (1/1 in 1944); L. W. Nordheim (1/1 in 1950).

Section 3.

Letters to H. A. Kramers from: Ministerie van Onderwijs, Kunsten en Wetenschappen (7/8 in 1946); J. R. Oppenheimer (3/6 in 1947-50); L. P. D. Opten Noort, Dept. van Opvoeding, Wetenschappen en Cultuurbescherming (8/18 in 1943); P. Scherrer, Dept. van Opvoeding, Wetenschappen, etc. (1/1 in 1943); M. L. Gouweloos, Dept. van Opvoeding, Wetenschappen, etc. (1/1 in 1943); M. F M Osborne (1/1 in 1947); J. Th. G. Overbeek (1/2 in 1944); G. A. Overbeek, Natuurwetenschappelijk Genootschap (1/1); Oxford U., Clarendon Lab. (1/1 in 1946).

Section 4.

Letters to H. A. Kramers from Jan Oort (9/19 in 1943-47).

Section 5.

Letters to H. A. Kramers from W. Opechowski (42/89 in 1940-51).,

Section 6.

Letters to H. A. Kramers from: Chaim L. Pekeris (3/5 in 1948-51); Albert Pérard, Bureau Intl. des Poids et Mesures (1/1 in 1951); A. L. Perrier (1/2 in 1944); Mary W. Peters (1/2 in 1948); W. van Peijpe (1/2); J. Podolanski (5/25 in 1941 [?]); G. Polvani (3/4 in 1950); A. v. C. Pos [?] (3/5 in 1945 [?]).

Section 7.

Letters to H. A. Kramers from: J. A. Prins (6/11 in 1942-49); Pro Civitate Academica Lugduno Batava (1/1 in 1948); K. F. Proost (6/13 in 1942-45); E. J. Dijksterhuis (1/1 in 1943).

Section 8.

Letters to H. A. Kramers from A. Pais (34/56 in 1942-48 [?]).

Section 9.

Letters to H. A. Kramers from R. E. Peierls (5/10 in 1948-53); H. K. to R. E. Peierls (5/8 in 1949-51).

Section 10.

Letters to H. A. Kramers from H. J. R. Perdijk (5/22 in 1943-46).

Section 11.

Letters to H. A. Kramers from: J. Reb [?] (2/3 in 1944); H. J. Rijks (1/1 in 1950); Rockefeller Foundation (4/9 in 1946-47); Rockefeller Inst. for Medical Res. (1/1 in 1947); J. Romein (7 letters in 1943-45); L. Rosenfeld (5/6 in 1942-51); S. Rosseland (1/1 in 1950); Royal Soc. of Edinburgh (3/11 in 1952); A. Rubinowicz (2/4 in 1946-49).

Section 12.

Letters to H. A. Kramers from Stefan Rozental (8/17 in 1946-52).

Section 13.

Letters to H. A. Kramers from A. J. Rutgers (11/26 in 1943-46).

Microfilm 14. H. A. Kramers Correspondence, 1940-52, S-Z

Section 1.

Letters to H. A. Kramers from: L. A. Sanders (1/4 in 1941); W. J. J. de Sauvage-Nolting, Willem Arntsz Stichting (3/5 in 1948); M. R. Shafrath (1/12 in 1952); J. J. Schilthuis, Amer. Enka Corp. (1/1 in 1947); J. F. Schouten (3/12 in 1941-48); H. M. E. Schürmann (1/1 in 1948); Romaine W. Seaver (1/2 in 1947); H. R. Senftleben (2/4 in 1944); H. Janne Serpe ( 1/1 in 1943); Manne Siegbahn (1/1 in 1946); P. C. Sikkerens [?] (1/2 in 1940); Ludwik Silberstein (1/10 in 1946)

Section 2.

Letters to H. A. Kramers from: F. Simon (1/2 in 1951); G. J. Sizoo (2/2 in 1946-47); H. K. to Prof. Skobjéltsin (1/2 in [1947]); J. C. Slater (2/2 in 1949-50); J. C. Slater to C. J. Gorter (1/1 in 1950); H. D. Smyth (1/1 in 1950); J. L. Snoek (2/10 in 1943); A. Sokolow and D. Iwanenko (1/2); A. W. Solleveld (1/1 in 1943); Solvay Inst. (2/2 in 1947-48); Springer Verlag (1/2 in 1944); A. J. Staverman to A. E. van Arkel (2/5 in 1947); A. E. van Arkel to A. J. Staverman (2/3 in 1947); N. V. Stavere [?], tot Keuring van Electrotechnische Materialen (1/1 in 1950); P. Swings (2/4 in 1946).

Section 3.

Letters to H. A. Kramers from Smithuysen [?] (19/49 in 1942-45).

Section 4.

Letters to H. A. Kramers from: E. Teller (1/1 in 1947); M. v. d. Tempel (1/1 in 1946); G. P. Thomson (2/5 in [1948]-52); W. J. de Tombe [?] (1/1 in 1941); W. Aeg. Timmerman (2/5 in 1944 [?]).

Section 5.

Letters to H. A. Kramers from: Udenrigsministeriet, Denmark (2/2 in 1942); G. Uhlenbeck (1/2 in 1941); J. M. van Uven (6/12, in 1949).

Section 6.

Letters to H. A. Kramers from: O. Veblen (1/1 in 1947); Frans Verdoorn (1/1 in 1946); J. E. Verschaffelt (1/3 in 1948); R. R. Vierhout [?] (2/4 in 1946-47); H. J. Vink (1/2 in 1947); J. H. van Vleck (2/2 in 1941-1951); F. Th. Van Voorst (1/1 in 1950); Hl. De Vries (1/2 in 1949); Vrij Nederl. Stichting (1/2 in 1946).

Section 7.

Letters to H. A. Krames from: B. L. v. d. Waerden (1/2 in 1948); Wageningen Studenten Onrust (1/3 in 1943); M. Waleton [?] (1/2 in 1939); Ivar Waller (2/2 in 1949); H. K., Notes and curves on He potentials and virial coeffs., I p.; Mrs. A. L. Warnshuis (1/2 in 1947); John R. van Wazer (1/2 in 1947); 1. Weiss (3/3 in 1951-52); J. J. Went (1/2 in 1951); G. Wentzel (2/3 in 1945); Adriaan Messelink [?] (2/3 in 1943-47); T. Werterd [?] (1/2 in 1944); G. Blake [Inst. for Adv. Study] (1/1 in 1939); Jan Weynenhoff [?] (1/1 in 1946 [?]); John Wheeler (1/2 in 1949); Gian Carlo Wick (1/2 in 1943).

Section 8.

Letters to H. A. Kramers from: E. C. Wiersma (1/1 in 1941); J. E. Wiersma (1/2 in 1944); K. Wiersma, Curatoren der Rijks U. te Leiden (617 in 1946-50); J. Wilks, Clarendon Lab. (1/2 in 1952); G. W. de Wit (1/1 in 1947); J. Wolff [?] (1/1 in 1943); P. de Wolff (1/2 in 1944); W. van der Woude (2/4 in 1946-47); S. Woulhuysen [?] (4/11 in 1946-49).

Section 9.

Letters to H. A. Kramers from: G. Wannier (12/27 in 1940-47); Roman Smoluchowski (1/1 in 1940).

Section 10.

Letters to H. A. Kramers from: Zauberend [?] (2/5 in 1946-47); F. Zernike (1/1 in 1945); K. Zuber (1/1 in 1943); C. Zwikker (2/2 in 1949); Unidentified (1/2); Unidentified (1/2 in 1944).

Section 11.

Kramers' Memoirs: Autobiographical sketch in French, 2 pp.; Newspaper clippings; Memorial, 3 pp.; Kramers' appointment as Ridder in de Orde van de Nederl. Leeuwen; Remarke on Alfvén's theory of the origin of the solar system, 4 pp.

Microfilm 15. H. A. Kramers-H. Hoek Manuscripts

Section 1.

H. A. Kramers: Manuscript notebook on Math. Physics, August-October, 1916, 72 pp.

Section 2.

H. A. Kramers: Manuscript on the Milne problem, sent as a letter to O. Klein, April 30, 1920, 9 pp.

Section 3.

H. A. Kramers: Typescript notes of "Forelaesning om termodynamik og kinetisk luftteori," spring semester, 1924, 56 pp.

Section 4.

H. A. Kramers: Manuscript notes on matrix mechanics, March 3 and 7, 1926, 7 pp.

Section 5.

H. A. Kramers: Manuscript notes entitled "Diffusie Potentiaal," July 1936, March 28, April 25 and April 30, 1937, 44 pp.

Sections 6-10.

H. Hoek: Manuscript notes probably made in connection with his dissertation "Algemene theorie der optische activiteit van isotrope media," with notes and comments by H. A. Kramers, 150 pp.

Section 11.

H. Hoek: Letter to Kramers, October 13, 1940, and summary of Lorentz' "Concerning the Relation between the Velocity of Propagation of Light and the Density and Composition of Media," [Verh. Kom. Akad. Amst. 18 (1878)], 7 pp.; Letter to Kramers, November 6, 1940, 1 p.; Letter to Kramers, November 27, 1940, including a typescript by Hoek, "Enige problemen betreffende de voortplanting van het licht in een ideaal Kristalrooster," 13 pp.; Letter to Kramers, December 23, 1940, including a typescript, "Theorie der optische activiteit van isotrope media," 12 pp.

Except for the drafts of Werner Kuhn's paper, these Kramers materials were all obtained by J. L. Heilbron in the Netherlands in April, 1963. The Kramers notebooks were selected by Heilbron from among a large collection belonging to Miss Martien Kramers, Heerenstraat 16A, The Hague, and were taken to Copenhagen for microfilmin

A list of the additional notebooks left with Miss Kramers is photographed before the borrowed notebooks on Microfilms 25 and 26. These notebooks, together with a few interleaved papers photographed on Microfilms 27 and 28, were returned to her at The Hague. Most of the other papers on Microfilms 27 and 28 were received from Professor N. G. van Kampen and were returned to him at the Institute of Theoretical Physics, University of Utrecht, Utrecht, The Netherlands. The remainder were supplied by Dr. J. B ' Ubbink, Burgravenlaan 10, Leiden, The Netherlands. Further Kramers papers dating from the late 1930's (the de Sitter problem and the shape of the earth), the 1940s (Brownian movement, quantum electrodynamics), and the early 1950s (rotons, superconductivity, lecture notes in Dutch on classical topics) remain with van Kampen and were not microfilmed. The drafts of Werner Kuhn's "Intensität von Thallium-Absorptionslinien," [Naturwiss. (1925) ], with Kramers' comments (Microfilm 27, Section 17) were received from W. Kuhn in Basel in March, 1963, and were returned to him at the Physikalisch-Chemisches Institut der Universitdt Basel, Klingelbergstrasse 80, Basel, Switzerland.

Microfilm 25. H. A. Kramers Notebooks, I

Section 1

"Klad[schrift] II, 1914-15, Geschiedenis theorie electromagnet. . . . Principes mechanical

Section 2.

"Kladschrift, 31 Mai, 1915, H. A. K."

Section 3.

"Radio-activiteit," 1915-16.

Section 4.

"Lorentz," 1915-16.

Section 5.

"Integraal vergelijking, statistics en quantosa," 1915-16.

Section 6.

"H. A. Kramers, Sept., 1916, K[ladschrift] II, Atoommodellen," 1916.

Section 7.

Notebook of English manufacturewithout title, 1916 and 1919.

Section 8.

"Forelaesninger I. Efteraar. 1920 ...Efteraar, 1921 ... Foraar, 1922," 1920-22.

Section 9.

"Adversaria Juni, 1921," 1920-22 and 1927.

Section 10.

"Forelaesninger II," 1923-24.

Section 11.

"Forelaesninger III," Foraar, 1924 ... Efteraar, 1924 ... Foraar, 1925. . . " 1924-25.

Microfilm 26. H. A. Kramers Notebooks, II

Section 1.

"Forelaesninger IV: Capita Selecta Quantum Mechanica," 1925-28.

Section 2.

"Atomteori," 1926.

Section 3.

"Atoommechanica....," 1928-31.

Section 4.

Lectures in America, 1928.

Section .5.

"Colleges Leiden, 1929-30 . . . Vrijdag college, 1933-34," 1929-35.

Section 6.

Lectures on elementary quantum mechanics, 1933-34.

Section 7.

"Alg. Atoomeheorie, 1932-33 ... 1935-36," 1932-36.

Section 8.

"Quantum-mech. 1937-38; Stralingstheorie 1937-38...... 1937-39 and 1948-49.

Microfilm 27. H. A. Kramers Notes and Memoranda, 1916-25

Sections 1-7.

Notes for a paper entitled "On the Mechanical Problem of the Motion of a Nuclear Atom with Two Electrons." Largely notes and manuscript draft dictated by Bohr to Kramers, but containing some independent notes by each, 1916-17, 70 sheets.

Sections 8-9.

Notes on general relativity, April and May, 1917, 62 sheets.

Sections 10-11.

Notes on adiabatic invariance, July and August, 1917, 58 sheets.

Sections 12-13.

Notes on the separability of the Hamilton-Jacobi equation, including a letter to Oskar Klein, February and March, 1920, 46 sheets.

Section 14.

Notes on general relativity, 27 sheets.

Section 15.

Draft of "On the Theory of X-ray Absorption, etc.," [Phil. Mag.

(1923)].

Section 16.

Notes and drafts for three unpublished papers connected with the Bohr-Kramers-Slater theory, January-February, 1925, 23 sheets.

Section 17.

W. Kuhn: Drafts of "Intensitit von Thallium-Absorptionslinien," [Naturtass. (1925)), with Kramers' comments, July, 1925, 16 sheets.

Microfilm 28. H. A. Kramers Notes and Drafts, 1926-52

Section 1.

Letter from R. Kronig to Kramers, February 7, 1926; Draft of R. Kronig's "On the Theory of Dispersion of X-rays," [J. Opt. Soc. Amer. (1926)).

Section 2.

Draft of an unpublished paper in Dutch by Kramers and K. F. Niessen on the WKB method, (1926), 17 sheets.

Section 3.

Typescript draft of Kramers' 1927 Como Conference paper, 9 sheets; notes and draft for non-technical lectures on causality in atomic physics, 1927-28, 22 sheets.

Section 4.

Letter from Kramers to Verschaffelt [Inst. Solvay], March 28, 1928; notes for 3 general lectures on atomic physics given in America in 1928, 12 sheets.

Section 5.

Lecture on the results yielded by quantum mechanics when applied to collision processes, October, 1928, 34 sheets.

Section 6.

Incomplete draft of an unpublished paper on quantum mechanical treatment of a few thought experiments [1928], 20 sheets.

Section 7.

Rough notes headed "Ionisatie Kurve (Frl. Meitner)," [1927-29], 3 sheets.

Section 8.

Draft of a paper on propagation of electromagnetic waves in crystals, November, 1930, 19 sheets.

Section 9.

Rough notes for two lectures at U. California (Los Angeles) on modern physics, 1931, 7 sheets; Lectures: "Werkelijkheid en begrippenvorming," .[1931], 21 sheets; "Elektronengeleiding in metaten" [1932], 2 sheets.

Section 10.

Rough notes on the probability interpretation in regard to a mixture of two quantum mechanical systems, October, 1936, 4 sheets; rough notes for a lecture in Swedish on the electron theory, with emphasis on C. Oseen's work, February, 1937, 3 sheets; rough notes on Born's linear field theory, December, 1938, 8 sheets.

Section 11.

Draft on electronic structure in the electron theory, 1940, 14 sheets.

Section 12.

Essay on Fresnel [Nedert. T. Natuurk. (1942)]; letters exchanged among Grandpré Molière, H. B. Dorgelo and L. Rosenfeld on philosophy of science (3/7 in 1942).

Section 13.

Letters to: Nobel Committee [giving recommendations] (1/4 in 1944); W. Heisenberg (1/6 in 1944).

Section 14.

Drafts of een theorie der deelties," [Nederl. T. Natuurk.

(1944)], 18 sheets; Letter to Jost (1/6 in 1947).

Section 15.

Draft, "Photons et neutrinos," 7 sheets. Section 16. Notes for lecture on quantum theory of dispersion, 3 sheets; notes, "College Delft 1952, lichtgolven en lichtquanta," 15 sheets.

Section 17.

Rough notes from some 15 miscellaneous lectures, dating perhaps from 1915 to 1950, 44 sheets.

This microfilm was received from R. Kronig, Technische Hogeschool Delft, Delft, The Netherlands, in December, 1962. It reproduces letters still in his possession.

Section 1.

Letters to R. Kronig from N. Bohr (4/7 in 1924-27).

Section 2.

Letters to R. Kronig from C. G. Darwin (2/4 in 1929).

Section 3.

Letters to R. Kronig from H. B. Dorgelo (3/5 in 1925).

Section 4.

Letters to R. Kronig from E. Fermi (9/20 in 1925-27).

Section 5.

Letters to R. Kronig from R. H. Fowler (7/11 in [1925-29]).

Section 6.

Letters to R. Kronig from W. Heisenberg (6/20 in 1925-27).

Section 7.

Letters to R. Kronig from E. Hulthén (3110 in 1928-29).

Section 8.

Letters to R. Kronig from F. Hund (2/3 in 1925).

Section 9.

Letters to R. Kronig from H. A. Kramers (3/8 in 1924-28).

Section 10.

Letters to R. Kronig from W. Pauli (8/22 in 1925-28).

Section 11.

Letters to R. Kronig from J. H. van Vleck (7/19 in 1926-28).

This microfilm was received from A. Rubinowicz, Hoza 74/4, Warsaw, Poland, in July, 1963. Prof. Rubinowicz also has copies of letters he has written but he did not consider them worth including.

Section A.

Letters to A. Rubinowicz from: C. J. Bakker (1/1 in 1933); N. Bohr to J. Geitler (1/2 in 1919); N. Bohr (17/31 in 1919-22); N. Bohr (13/18 in 1933-62).

Section B.

Letters to A. Rubinowicz from: J. M. Burgers (1/1 in 1919); D. Coster (1/2 in 1920); Mme Curie (1/1 in 1920); P. S. Epstein (3/9 in 1918); R. Frerichs (1/1 in 1930); O. Halpern (4/18 in 1922-23); G. de Hevesy (1/2 in 1920); H. A. Kramers (4/9 in 1920-39); H. J. Leeuwen (1/1 in 1917); P. W. Merrill (3/4 in 1929-30); W. Pauli (2/3 in 1938); J. J. Placinteanu (2/3 in 1930); E. Schrödinger (1/2 in 1946); H. Th. Simon (2/2 in 1918); A. Smekal (2/4 in 1931-32).

Section C.

Letters to A. Rubinowicz from: A. Sommerfeld (50/92 in 1915-43); P. Swings (1/1 in 1939); T. Takamine (1/1 in 1920); P. Zeeman (2/5 in 1930-32).

These materials were received from P. Jordan in February, 1963, and were returned to him at his home, Isestrasse 123, Hamburg, Germany.

Section 1.

Letters to P. Jordan from: N. Bohr (2/2 in 1927-28); S. C. Sekhar (1/1 in 1928); P. Dirac (2/6 in 1926-28); A. Einstein (1/2 in 1926); M. Göppert (1/2 in [late 1920s]).

Section 2.

Letters to P. Jordan from: W. Heisenberg (24/49 in 1925-30); W. Heisenberg to M. Born (2/8 in 1925-26).

Section 3.

Letters to P. Jordan from: O. Klein (2/3 in 1927); P. P. Koch (2/3 in 1929); S. Kikuchi (1/1).

Section 4.

Letters to P. Jordan from R. Kronig (4/8 in 1927-28).

Section 5.

Letters to P. Jordan from: W. Lenz (1/1 in 1929); M. Maar (1/2); Yoshio Nishina (1/1 in 1928).

Section 6.

Letters to P. Jordan from: L. S. Ornstein (1/2 in 1923); W. Pauli (1/1 in 1928); M. Planck (113 in 1929).

Section 7.

Letters to P. Jordan from: E. Schrödinger (2/4 in 1927-29); Springer Verlag, Contract regarding publication of Elementare Quantenmechanik (113 in 1929).

Section 8.

Letters to P. Jordan from H. Tetrode (2/8 in 1927).

Section 9.

Letters to P. Jordan from: Velles (1/1 in 1929); Ivar Waller (3/5 in 1927-28); G. Wentzel (2/4 in 1926).

Section 10.

Letters to P. Jordan from: Hermann Weyl (4/8 in 1925); R. Weyrich (1/2 in 1923).

Section 11.

Letter to P. Jordan from E. P. Wigner, including corrected proof sheets of article in Hungarian by Wigner with German abstract (1/9 in 1925).

These materials were all received from W. Gerlach in Munich in February, 1963, and returned to him at the Physikalisches Institut der Universität, Munich, Germany. The letter from Gerlach to Edgar Meyer in Section 6 was obtained by Prof. Gerlach from Meyer's widow in Zurich.

Section 1.

Letters to W. Gerlach from: E. N. da C. Andrade (1/1 in 1924); H. Baerwald (1/1 in 1921); O. Bauer [Kaiser-Wilhelm Inst. für Metallforschung] (1/1 in 1923); Emil Baur (1/2 -in 1922); Bechhold [Die Umschau] (1/1 in 1922); N. Bohr (1/1 in 1922); M. Born (16/29 in 192129); Mrs. Nalini Bose to Früulein Probst (1/4 in 1928); E. Buchwald (2/2 in 1922).

Section 2.

Letters to W. Gerlach from: H. Cornelius (1/1 in 1923); R. Courant (1/2 in 1921); F. Dessauer (1/1 in 1922); H. Diesselhorst (2/3 in 1924); Wilhelm Eitel (1/1 in 1924); A. Eucken (2/2 in 1922-23); H. v. Euler (1/1 in 1923).

Section 3.

Letters to W. Gerlach from: K. Fajans (2/2 in 1921-23); J. Franck (10/15 in 1921-23); H. Grimm (1/2 in 1922); W. Grotrian (1/1 in 1922); B. Gudden (2/4 in 1922).

Section 4.

Letters to W. Gerlach from: F. Haber (2/3 in 1922); T. L. Haering (1/4 in 1927); M. Hartmann (1/1 in 1937); J. A. Hedrall [G6teborg] (3/5); F. Henning (1/1 in 1920); G. Hertz (4/8 in 1922); Julius Herweg (1/4 in 1919); F. Himstedt (1/1 in 1921); G. Holst (1/1 in 1922); K. Honda (1/3 in 1922 [?]); Robert Hull (1/1 in 1924).

Section 5.

Letters to W. Gerlach from: A. Johnsen (mineralog. (2/4 in 1921-22); W. Kaufmann (4/4 in 1921-24) Fritz Kirchner (2/7 in 1921 [ ?] ); H. Konen (1/1 in 1922); W. Kossel (1/2 in 1921); P. Lasareff (1/2 in 1922); P. Lenard (1/1 in 1924); R. E. Liesegang (2/2 in 1921-22); R. Lorenz (1/2 in 1921).

Section 6.

Letters to W. Gerlach from: E. Madelung (2/3 in 1921-22); A. Magnus (3/7 in 192122); Lise Meitner (1/1 in 1922); G.'.Merling (?] (1/2 in 1922); E. Meyer (5/9 in 1922-29.); W. G. to E. Meyer (1/2 in 1921); P. J. Nolan (1/2 in 1921); Noorden [?] (1/2 in 1922).

Section 7.

Letters to W. Gerlach from: F. Paschen (4/6 in 1921-25); W. Pauli (2/4 in 1922); M. Planck (1/2 in 1928); H. Rau (1/1 in 1923); E. Regener (2/3 in 1922); H. Reichenbach (1/2 in 1922); H. Reissner (1/1 in 1921); M. Rosenberg (4/8 in 1921-22); H. Rubens (1/1 in 1921); W. G. to H. Rubens (1/1 in 1921); M. Rumden [Kanzleramt der U. Tübingen] (1/3 in 1922).

Section 8.

Letters to W. Gerlach from: C. Schaefer (2/3 in 1921); Karl Schaum (1/1 in 1923); K. Scheel (1/1 in 1922); P. Scherrer (1/1 in 1921); W. Schottky (1/1 in 1923); Frau Emma Schüler-Paschen (2/5 in 1924); F. A. Schulze (2/2 in 1921-23); W. O. Schumann (1/1 in 1923); R. Seeliger (1/1 in 1923); H. Th. Simon [Phys. Zs.] (1/1 in 1916); Hertha Sponer (1/2 in 1922); Otto Stern (1/2 in 1924); B. Strauss (2/2 in 1921); H. Stücklen (1/1 in 1922).

Section 9.

Letters to W. Gerlach from: W. Voigt (1/2 in 1918); R. Wachsmuth (3/6 in 1922-23); Hans v. Wartenberg (1/1 in 1922); Fritz Weigert (1/2 in 1928); M. Wien (1/2 in 1922); W. Wien (1/1 in 1924); H. Zahn (1/2 in 1922).

Approximately one-third of these materials, including most of the lecture notes, were received from Professor Fritz Bopp in Munich in February, 1963. The other two-thirds were received from A. Sommerfeld's son, Dr.-Ing. Ernst Sommerfeld, in several installments between December, 1962, and April, 1963, initially with Dr. Paul Rosbaud of Undon as intermediary. Since the materials from these two sources were in some degree complementary, they were integrated for microfilming. The materials lent by F. Bopp were returned to him at the Institute of Theoretical Physics of Munich University, Munich, Germany, and those lent by E. Sommerfeld were returned to him at Dunantstrasse 6, Munich 23, Germany.

Microfilm 21. A. Sommerfeld Lectures and Seminars,

Section 1. "Maxwell'sche Theorie," 1906-07, 72 sheets.

Section 2. "Elektronentheorie," 1906-07,47 sheets.

Section 3. "Thermodynamik," 1907, 56 sheets.

Section 4. "Theorie der Strahlung," 1907, 60 sheets.

Section 5. "Ausgewählte Kap. der Thermodyn.," 1907-08, 74 sheets.

Sections 6-7. "Kinetische Gastheorie," 1907-08, 100 sheets.

Section 8. "Warmeleitung, Diffusion und Elektrizitätsleitung nebst ihren molekular- und elektronentheoret. Zusammenhingen," 1908, 84 sheets.

Microfilm 22. A. Sommerfeld Lectures and Seminars, II

Sections 1-3. "Optik," Summer semester, 1909, 78 sheets.

Sections 4-5. "Elektronentheorie," Winter semester, 1909, 59 sheets.

Section 6. "Thermodynamik bewegter Systeme," Winter semester, 1909-10, 16 sheets.

Section 7. "Ausgewählte Fragen der physikatischen Statistik," Winter semester, 1913-14 [?] 35 sheets.

Section 8. "Wärmestrahlung," Summer semester, 1922, 15 sheets.

Section 9. Classical topics, undated, 10 sheets.

Sections 10-12. Ausarbeitung of "Theoretische Optik," Summer semester, 1925, 116 sheets.

Sections 13-14. Ausarbeitung of "Thermodynamik und kinetische Gastheorie," Winter semester, 1925-26, 94 sheets.

Sections 15-16. Ausarbeitung of "Thermodynatnik und Gastheorie," Winter semester, 1934-35, 126 sheets.

Section 17. "Ergänzung zu Randwertaufgaben der Physik," Summer semester, 1935, 10 sheets.

Microfilm 23. A. Sommerfeld Unpublished Manuscripts and Miscellaneous Papers

Section 1. Fourier series treatment of heat conduction, [1890], 32 sheets.

Section 2. Fourier series treatment of heat conduction in one dimension, [1890?], 5 sheets.

Sections 3-4. "Mathematische Theorie der Beugung," [1893?], 95 pp.

Section 5. Projective Geometry, [1896?], 10 sheets.

Section 6. Talk to students at the U. California, [1922-23], 9 sheets; talk in English on the development of quantum theory, February 15, 1923, 2 pp.

Section 7. Memorial address on Röntgen, [1928], 1 sheet; "Zwanglose. Ludwig Boltzmann zum 100. Geburtstag," October 31, 1944, 2 pp.

Section 8. Autobiographical Sketch, [1918? and 1950?], 11 pp.

Sections 9-15. Problem-sets from the Übungen connected with Sommerfeld's lectures: Mechanics, 1913-14; Thermodynamics, 1915-16; Hydrodynamics, 1921; Thermodynamics. 1922-23; Optics, 1925; Thermodynamics, 1925-26; Thermodynamics, 1928-29; Thermodynamics, 1931-32; Thermodynamics, 1934-35; Miscellaneous.

Microfilm 29. A. Sommerfeld Correspondence, A-B

Section 1. Unidentified items, largely letters by Sommerfeld (19/26 in 1921-39).

Section 2. Unidentified letters or parts of letters, 8 sheets. Letters from a close friend and colleague in exile from Germany (2/3 in 1938-39). A. Sommerfeld, manuscript and notes on physical properties of the aether, 1 p.; manuscript notes on the definition of the curl, 1 sheet.

Section 3. Letters to A. Sommerfeld from M. Abraham (17/56 in 1898-1904).

Section 4. Letters to A. Sommerfeld from: N. Ach (113 in 1904); Amer. Assn. Adv. of Science (1/1 in 1933); R. Atkinson (1/3 in 1932); P. Auger (1/1 in 1941); Auswärtiges Amt (1/1 in 1937); A. S. to Auswirtiges Amt (1/1 in 1922).

Section 5. Letters to A. Sommerfeld from E. Back (10/36 in 1920-22).

Section 6. Letters to A. Sommerfeld from: O. von Baeyer (1/4 in 1911); E. Bagge (1/5 in 1946); G. H. Barkhausen (1/3 in 1930); A. Battelli (1/5 in 1907).

Section 7. Letters to A. Sommerfeld from K. Bechert (15/42 in 1934-47).

Section 8. Letters to A. Sommerfeld from: R. Bechmann (1/4 in 1948); R. Becker (3/5 in 1928-39); W. Becker (2/4 in 1947); A. Berliner (5/14 in 1933-35); A. Berliner to M. Planck (1/2 in 1934).

Section 9. Letters to A. Sommerfeld from: Erich Beth (3/11 in 1933-35); A. S. to H. Bethe (1/1 in 1946); H. Bethe (2/4 in 1933); J. A. Betz [?] (2/9 in 1911-12); H. Beutler (1/2 in 1935); V. Bierknes (1/4 in 1900); O. Blumenthal (3/6 in 1913-33); Maxime Bôcher (1/3 in 1901); E. Bodea (1/4 in 1944).

Section 10. Letters to A. Sommerfeld from H. Bohr (1/1 in 1934); A. S. to H. Bohr (1/1 in 1934); N. Bohr (1/1 [c. 1935]); H. du Bois (5/30 in 1899-1906).

Section 11. Letters to A. Sommerfeld from: L. Boltzmann (2/4 in 1899); K. F. Bonhoeffer (1/3 in 1940); G. B. Bonino (2/2 in 1937-38); Bonn U. (1/1 in 1934); R. Bopp (2/6 in 1948-49); M. Born (1/2 in 1926); A. S. to M. Born (1/1 in 1921); C. J. Bouwkamp (3/4 in 1949).

Section 12. Letters to A. Sommerfeld from: W. H. Bragg (4/12 in 19[11]-47); G. Breit (1/1 in 1940); G. H. Briggs (1/1 in 1925); R. Brill (1/5 in 1940); L. Brillouin (2/4 in 1934-35); A. S. to L. Brillouin (2/2 in 1930-38); M. Brillouin (1/4 in 1936).

Section 13. Letters to A. Sommerfeld from: Brockmann [Provinzial Schulrath] (1/1 in 1883); H. A. Brück (1/4 in 1938); T. L. de Bruin (1/1 in 1934); G. H. Bryan (10/46 in 1899-1902).

Section 14. Letters to A. Sommerfeld from: E. Buchwald (2/2 in 1934-35); H. Burkhardt (4/8 in 1899-1906); D. Buschensteiner (1/2 in 1923); V. Bush (1/2 in 1932).

Microfilm 30. A. Sommerfeld Correspondence, C-F

Section 1. Letters to A. Sommerfeld from: Cabrera (1/3 in 1928); Campo y Cerdin (1/2 in 1923); A. S. to Carlsbergfond (1/2 in 1919); H. S. Carslaw (15/55 in 1897-1900).

Section 2. Letters to A. Sommerfeld from: M. Catalán (4/7 in 1923-39); Christlein (1/2 in 1946); K. Clusius (2/2 in 1938-39); E. Cohn (2/8 in 1901); W. Colby (1/2 [c. 1929]); A. S. to K. T. Compton (1/1 in 1930); E. Condon (1/2 in 1932); A. Sommerfeld: Report on conversations re Conseil de Recherches, 1929, 1 p.

Section 3. Letters to A. Sommerfeld from: D. Coster (1/2 in 1921); Des Coudres (2/8 in 1896-97); C. Cranz (9/25 in 1897-1900).

Section 4. Letters to A. Sommerfeld from: Frau Dänzer-Vernotti (1/2 in 1950); A. S. to Dänzer-Vernotti (1/1 in 1950); Danzig U. (1/2 in 1931); E. David (2/8 in 1933-34); P. Debye (2/5 in 1936-39); J. Destouches (2/3 in 1942-46); H. D. Diehl (1/2 in 1941). Section .5. Letters to A. Sommerfeld from: H. Diesselhorst (7/26 in 1900-50); W. Döring (2/4 in 1949); E. Dorn (1/2 in 1900).

Section 6. Letters to A. Sommerfeld from: P. Drude (4/10 in 1899-1901); E. v. Drygalski (3/6 in 1917); W. Duane (1/2 in 1924); D. W. van Dyck (4/8 in 1900-29).

Section 7. Letters to A. Sommerfeld from: C. Eckart (4/10 in 1928-30); P. Ehrenfest (3/28 in 1911-12).

Section 8. Letters to A. Sommerfeld from: W. Eilender (2/5 in 1933-[34]); A. Einstein (1/1 in 1946); V. W. Ekman (1/2 in 1935); J. Eldridge (1/2 in 1924); G. Elwert (1/3 in 1946); F. Emde (6/12 in 1908-37); A. S. to F. Emde (1/1 in [1929]).

Section 9. Letters to A. Sommerfeld from: Enzy. d. Math. Wiss. (1/4 in 1931); D. Enskog (2/10 in 1917); P. S. Epstein (1/2 in 1937); A. Eucken (4/7 in 1928-43); P. P. Ewald (1/2 in 1935); A. S. to P. P. Ewald (1/1 in 1930).

Section 10. Letters to A. Sommerfeld from: G. Faber (1/2 in 1944); K. Fajans (2/8 in 1937); Ugo Fano (2/7 in 1936-40); W. Finkelnburg (3/19 in 1945-46); A. S. to Finkelnburg (1/1 in 1938).

Section 11. Letters to A. Sommerfeld from: Fleischmann (1/3 in 1949); J. A. Flerning, Dept. Terrestrial Magnetism, Carnegie Inst. (1/1 in 1933); A. D. Fokker (3/10 in 1941); A. S. to A. D. Fokker (1/2 in 1941); P. Foote (1/2 in 1935).

Section 12. Letters to A. Sommerfeld from A. Föppl (7127 in 1900-04).

Section 13. Letters to A. Sommerfeld from: R. H. Fowler (1/3 in 1935); H. Frahm (1/3 in 1904); J. Franck and G. Hertz (1/2 in 1913); N. H. Frank (1/2 in 1930); Walter Frank [?] (1/4 in 1950).

Section 14. Letters to A. Sommerfeld from: J. I. Frenkel (3/14 in 1928-31); R. Fricke (3/14 in 1907-08); E. Fues (3/6 in 1936-44).

Microfilm 31. A. Sommerfeld Correspondence, G-K

Section 1. Letters to A. Sommerfeld from: R. Gans (2/7 in 1927-42); E. Girtner (1/2 in 1946); G. Gentile (2/4 in 193541); W. Gerlach (3/8 in 1922-26); Ges. Telefunken (1/2 in 1920); Glocker (1/1 in 1935).

Section 2. Letters to A. Sommerfeld from: E. Goldstein (1/6 in 1913); P. Gombas (1/1 in 1943); A. S. to P. Gombas (1/1 in 1943); C. Gorter (1/1 in 1935); R. Götze (1/4 in 1921); A. Greenhill (6/16 in 1898-1902).

Section 3. Letters to A. Sommerfeld from: A. S. to F. Grover [Union Coll.] (1/2 in [1923]); E. Grüneisen (2/3 in 1934-37); B. Gudden (2/2 in 1935-44); E. Guggenheim (1/1 in 1937); V. Guillemin (2/4 in 1934[?]-38).

Section 4. Letters to A. Sommerfeld from: F. Haber (317 in 1911); H. Haga (3/10 in 1906-12); O. Hahn (1/2 in 1939); G. Hamel (3/12 in 1907-43); A. S. to G. Hamel (1/1 in 1943); R. Hammer (1/2 in 1948); A. S. to R. Hammer (1/1 in 1948). Section,5. Letters to A. Sommerfeld from: F. Harms (1/1 in 1935); G. Harnwell (1/2); H. Hartmann (2/5 in 1941-45); F. Hartogs (1/4 in 1928); A. Hauser (1/1 in 1934); W. Heisenberg (10/24 in 1931-48).

Section 6. Letters to A. Sommerfeld from: W. Henneberg (1/2 in 1932); G. Herglotz (3/8 in 1905); C. Hermann (2/4 in 1940-41); A. S. to C. Hermann (1/3 in 1940); G. Herzberg (1/1 in 1935); K. Herzfeld (2/6 in 19[30]-35); K. Herzfeld, Vita as of c. 1921, 1 p.; W. Hicks (1/1 in 1924).

Section 7. Letters to A. Sommerfeld from: D. Hilbert (3/8 in 1909-12); R. Hilsch (2/4 in 1948); Hirzel Verlag (2/4 in 1924-38); E. Hobson (1/4); J. Holtsmark (1/2 in 1948); D. Hondros (1/8 in 1909).

Section 8. Letters to A. Sommerfeld from: L. Hopf (3/12 in 1933-38); A. S. to L. Hopf (1/2 in 1937); Wm. Houston (3/8 in 1924-28); N. Howitt (1/1 in 1928); F. Hund (1/1 in 1935).

Section 9. Letters to A. Sommerfeld from: Ignatowsky (2/10 in 1905-06); J. Jeans (1/4 in 1913); A. Joffé (113 in 1934); G. Joos (5/12 in 1929-40) P. Jordan (1/1 in 1950).

Section 10. Letters to A. Sommerfeld from: A. Kalaehne (1/4 in 1905); H. Kamerlingh-Onnes (13/40 in 1899-1906).

Section 11. Letters to A. Sommerfeld from: A. S. to P. Kapitza (1/1 in 1930); P. Kapitza to Pierre Weiss (1/2 in 1933); A. S. to T. v. Kármán (2/2 in 1929); W. Kaufmann (1/4 in 1905); H. Kayser (113 in 1935); W. Keesom (2/6 in 1913-41); F. Kirchner (2/5 in 1936-48); G. Kirsch (2/5 in 1930-37).

Section 12. Letters to A. Sommerfeld from: F. Klein (16/49 in 1899-1909).

Section 13. Letters to A. Sommerfeld from: W. Knie (2/4 in 1936-46); F. Kohlrausch (1/2 in 1934); H. Konen (2/4 in 1921-35); A. Kopff (113 in 1930); M. Koppe (2/8 in 1898); A. Korn (1/8 in 1907); D. Korteweg (3111 in 1899-1900).

Section 14. Letters to A. Sommerfeld from: W. Kossel (2/4 in 1924-25); H. A. Kramers (3/8 in 1924-38); F. Krammer (1/4 in 1948); A. Kratzer (1/2 in 1922); G. Kuerti (1/2 in 1949); H. Kulenkampff (1/4 in 1937); P. Kunze (1/2 in 1948).

Microfilm 32. A. Sommerfeld Correspondence, L-O

Section 1. Letters to A. Sommerfeld from: H. Lamb (1/4 in 1910); Frau Landauer, Kommerzienrat (1/1 in 1921); A. Landé (1/2 in 1921); E. Lange (1/2 in 1929); C. Lanczos (1/2 in 1930); Lampariello (7/10 in 1950); O. Laporte (113 in 1948) J. Larmor (1/4 in 1900).

Section 2. Letters to A. Sommerfeld from: M. v. Lane (7/13 in 1907-48); A. S. to M. v. Lane (1/1 in 1948); P. Lenard (2 11 in 1913); W. Lenz (2/11 in 1932); T. Levi-Civita (5/14 in 1899-1904).

Section 3. Letters to A. Sommerfeld from: G. Lewis (1/2 in 1910); C. Linde (3/5 in 1902-28); F. A. Lindemann (4/17 in 1905-11); O. Lodge (1/4 in 1900); L. B. Loeb (3/5 in 1933-38); A. S. to L. B. Loeb (1/1 in [1933]); F. London (1/4 in 1927).

Section 4. Letters to A. Sommerfeld from: H. A. Lorentz (9/50 in 1899-1903); A. Love (1/4 in 1901); F. Ludi (1/1 in 1932).

Section 5. Letters to A. Sommerfeld from: H. Maass (1/2 in 1944); H. Macdonald (1/6 in 1902); W. Magnus (1/4 in 1947); M. Maier (1/4 in 1900); A. S. to J. D. Main-Smith (1/2 in [1924]); H. v. Mangoldt (113 in 1898); R. Marcolongo (1/4 in 1913); A. W. Maue (1/1 in 1950).

Section 6. Letters to A. Sommerfeld from: W. Meggers (4/6 in 193641); A. S. to W. Meggers (1/1 in 1936); R. Mehmke (2/3 in 1901-04); J. Meixner (2/4 in 1946-50); Mendelssohn (1/1 in 1937); C. E. Mendenhall (3/3 in 1923-34); E. Meyer (2/7 in 1912-13); A. Michels (1/1 in 1937).

Section 7 . Letters to A. Sommerfeld from: G. Mie (4/19 in 1900-35); R. Millikan (2/2 in 1927); A. S. to R. Millikan (2/2 in 1928-31); A. S. to E. Milne (1/4 in 1928); H. Minkowski (4/7 in 1899-1908); R. Minkowski (1/1 in 1945). 1

Section 8. Letters to A. Sommerfeld from: M. Minnaert (1/4 in 1919); O. Mohr (2/5 in 1903); W. Morton (2/8 in 1900); N. F. Mott (1/2 in 1936); O. Muck (1/2 in 1948); A. S. to U. Munich, Philosophical Faculty (1/2 in 1928); A. S. to Rector, U. Munich [?] (1/1 in 1939).

Section 9. Letters to A. Sommerfeld from: W. Nernst (2/6 in 1934-35); C. Neumann (2/13 in 1903); E. F. Nichols (1/2 in 1905); K. Niessen (1/3 in 1930); A. S. to Nobelkomitee f. Physik (1/2 in 1922); F. Noether (2/5 in 1913-34); L. Nordheim (6/10 in 1934-37); A. S. to Notgemeinschaft Dent. Wiss. (1/2 in 1921); A. S. to Noyes (1/1).

Section 10. Letters to A. Sommerfeld from: L. S. Ornstein (3/6 in 1925); W. Osgood (1/2 in 1933); Wo. Ostwald (1/1 in 1926); A. S. to Wo. Ostwald (1/1 in [1926]); H. Ott (2/9 in 1933-50).

Microfilm 33. A. Sommerfeld Correspondence, P-Schm

Section 1. Letters to A. Sommerfeld from: F. Paschen (89/312 in 1899-1924); Tübingen U. [G. Hessenberg] (1/4 in 1922). Section O. Letters to A. Sommerfeld from: W. Pauli (6/21 in 1923-49); A. S. to W. Pauli (1/2 in 1949); L. Pauling (1/1 in 1945); G. Pegram (1/1 in 1931); O. Perron (3/4 in 1935-50); H. Pierson (1/3 in 1936).

Section 3. Letters to A. Sommerfeld from: M. Planck (3/7 in 1899-1947); F. Pockels (9/28 in 1899-1902); R. Pohl (2/6 in 1912); H. Poincaré (1/3).

Section 4. Letters to A. Sommerfeld from: F. Pollaczek (1/2 in 1937); L. Prandtl (6/11 in 1901-50); Preuss. Minist. f. Wiss. (1/1 in 1928); P. Pringsheim (1/2 in 1928); R. Pummerer (1 /2 in 1946).

Section 5. Letters to A. Sommerfeld from: G. Quincke (1/2 in 1900); E. Ramberg [?] (1/2 in 1935); H. Rau (1/1 in 1927); H. Rausch v. Traubenberg (315 in 1928-30); A. E. Ruark (1/5 in 1924); S B. Ray (1/1 in 1937); Lord Rayleigh (1/4 in 19fl).

Section 6. Letters to A. Sommerfeld from: A. S. to Reichserziehungsminist. (1/1 in 1938); H. Reissner (2/5 in 1907); A. S. to Ricker (1/1 in 1930); E. Riecke (1/2 in 1899); W. Rogowski (1/2 in 1923); A. S. to W. Rogowski [?] (1/2 in [1923]); W. Romberg (1/2 in 1943); G. Ronge (1/1 in 1950); A. S. to W. C. Röntgen (1/2 in 1918); recommendation for A. Rubinowicz from A. S. to rector of U. Laibach (1/2 in 1920); A. Rubinowicz (4/9 in 1936-49); H. Russell (1/1 in 1939).

Section 7. Letters to A. Sommerfeld from: F. Sauter (1/2 in 1946); K. Scheel (1/1 in 1928); Schenck (1/2 in 1928); O. Schlick (5/18 in 1902).

Section 8. Letters to A. Sommerfeld from: H. Schmidt (2/6 in 1911); O. Schmidt (7/11 in 1936-41); A. S. to O. Schmidt (1/1 in 1936).

Microfilm 34. A. Sommerfeld Correspondence, Scho-Z

Section 1. Letters to A. Sommerfeld from: Schoenflies (3/9 in 1898-99); G. Schott (1/2 in 1936); W. Schottky (1/2 in 1928).

Section 2. Letters to A. Sommerfeld from: E. Schrödinger (11/51 in 1938-49); A. S. to Frau Schrödinger (1/1 in 1943); A. S. to E. Schrödinger (2/3 in 1924-46).

Section 3. Letters to A. Sommerfeld from: H. Schüler (1/1 in 1947); E. Scripture (1/1 in 1928); G. Searle (2/12 in 1911-50); H. Seeliger (113 in 1902); R. Seeliger (1/2 in 1927); M. Siegbahn (8/14 in 1917-40).

Section 4. Letters to A. Sommerfeld from: L. Silberstein (5/23 in 1909-19); A. Smekal (2/3 in 1923-31).

Section 5. Letters to A. Sommerfeld from: D. v. Soden (117 in 1945); Starke (1/4 in 1927); E. Stoner (2/4 in 1934-38); H. Straub (1/1 in 1936); C. Straubel (1/2 in 1899); E. Stueckelberg v. Breidenbach (1/1 in 1937).

Section 6. Letters to A. Sommerfeld from: T. Takamine (416 in 1923); J. S. Foster to T. Takamine (1/4 in 1923); W. Thies (113 in 1948); S. Titeica (1/4 in 1935); B. Touschek (2/5 in 1941-42); Tübingen U. (1/1 in 1934); A. S. to 'tübingen U. (2/3); A. S. to M. Tuve (1/1 in 1940).

Section 7. Letters to A. Sommerfeld from: E. Uehling (1/4 in 1929 [?]); A. S. to K. Uller (1/2 in 1920); A. Unsöld (5/14 in 1936-40); A. S. to A. Unsöld (1/1 in 1937); Verschaffelt (2/4 in 1935-36).

Section 8. Letters to A. Sommerfeld from: W. Voigt (14/48 in 1899-1913); A. S. to W. Voigt (1/4 in 1913).

Section 9, Letters to A. Sommerfeld from: R. Volkmann (2/8 in 1899); V. Volterra (1/3 in 1900).

Section 10. Letters to A. Sommerfeld from: J. D. van der Waals, Jr. (3/6 in 1935-37); B. L. van der Waerden (1/2 in 1937); O. Wallach (3/11 in 1899-1915); B. Walter (1/4 in 1912); A. Wangerin (2/4 in 1899-1904).

Section 11. Letters to A. Sommerfeld from: H. Weber (8/23 in 1898-1902); V. Weisskopf (1/4 in 1937); C. F. v. Weizsäcker (113 in 1942); H. Welker (1/3 in 1947).

Section 12. Letters to A. Sommerfeld from: G. Wentzel (5/14 in 1927-31); Wergeland (3/9 in 1943-44); H. Weyl (2/8 in 1911); G. Wick (1/4 in 1942); E. Wiechert (1/1 in 1898).

Section 13. Letters to A. Sommerfeld from: M. Wien (5117 in 1904-09); W. Wien (8/22 in 1897-1909).

Section 14. Letters to A. Sommerfeld from: A. S. to W. Wilson (1/1 in 1933); C. H. Wind (7/30 in 1900-09).

Section 15. Letters to A. Sommerfeld from: W. Wirtinger (2/12 in 1900-01); Wisconsin U. (1/1 in 1933); A. S. to Wisconsin U. (1/1 in 1933); R. W. Wood (1/2 in 1923); G. Wulff (4/17 in 1913).

Section 16. Letters to A. Sommerfeld from: P. Zeeman (6/13 in 1916-29); J. Zenneck (5/11 in 1900-43); F. Zernike (1/1 in 1940).

The C. G. Darwin materials on Sections 1-5 of this film are all those found by Lady Darwin when preparing to leave the family home in Cambridge following Sir Charles' death. They were received in May, 1963, and after microfilming were forwarded, on Lady Darwin's instructions, to the American Philosophical Society, Philadelphia, Pennsylvania, for permanent deposit.

P. A. M. Dirac selected for microfilming the materials on Sections 6-12 from a larger collection of notes and papers at his home, 7 Cavendish Avenue, Cambridge, England. They were received in May, 1963, and returned to Prof. Dirac after filming. For other Dirac materials see Microfilms 59 and 77.

Section 1.

Letters to C. G. Darwin from: N. Bohr (2/3 in 1937- [39]); O. Klein (1/1 in 1927); M. Born (1/4 in 1927); J. Frenkel (1/4 in 1927); H. G. J. Moseley (2/16 in 1914); H. R. Robinson (1/5 in 1927); E. Schrödinger (2/5 in 1927). Two photographs of physics staff at Manchester, 1912.

Section 2.

C. G. Darwin: Manuscript of Smith Prize Essay, "On a Theory of the Cause of Magnetic Storms," 1911, 30 pp.; "The Theory of Radiation," 1912, 55 pp.; translation of H. Poincaré's "Sur la theorie des quanta," [J. de Phys, (1912) ].

Section 3.

C. G. Darwin: Critique of the foundations of physics, 1919, 7 pp.; notes on atom mechanics, 1919, 45 pp.

Section 4.

C. G. Darwin: Letters from J. E. Littlewood (1/9 in 1921); typescript for Nature, 1923; various undated notes, 10 pp.

Section 5.

C. G. Darwin: Programatic expositions of what is wrong with (a) relativistic wave equations and quantum statistics, November 1928, 3 pp.; (b) quantum electrodynamics, [1929-30], 13 pp.; reference notes on dispersion. 1934, 28 pp.

Section 6.

P. A. M. Dirac: Talk on relativity, [1924], 6 pp.; Drafts treating Liouville's theorem, the correspondence principle, and adiabatic: invariance, [1924], 7 sheets.

Section 7.

P. A. M. Dirac: Rough calculations with action-angle variables, [1924], 21 sheets; letters to P. A. M. Dirac from C. G. Darwin proposing work on the connection between quantization and the choice of coordinates, with Dirac's notes and draft on the problem (2/23 in 1924-25).

Section 8.

P. A. M. Dirac: Notes on R. H. Fowler's lectures on quantum theory, [1924-26], 86 pp.

Section 9.

P. A. M. Dirac: Report on Einstein-Bose statistical mechanics, [mid-1925], 11 sheets; notes and draft on Heisenberg's quantum mechanics, .[Fall 1925], 9 pp.

Section 10.

P. A. M. Dirac: Talk to 1927 Solvay Congress, 6 pp.; notes and exposition of q-numbers, [late 1920s], 10 pp.

Section 11.

P. A. M. Dirac: "Lectures on Modern Quantum Mechanics," [1927-29], 115 pp.

Section 12.

P. A. M. Dirac: Critical exposition of Heisenberg-Pauli paper, [1929], 8 pp.; "Theory of the Positron," [1934], 11 pp.; W. Pauli: Manuscript draft, "Formulierung der Quantenelektro.dynamik mit sichinvarianten Grössen," [1932], 8 pp.