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Abe, T.

T. Abe, Mazda Kenkyu-Jiho, 3, p. 325; 1928. (In English.)

Abney, W. de W.

W. de W. Abney, Phot. Jour., 18, p. 302; 1893–4. L. A. Jones and E. Huse, this journal, 7, p. 1079, 1923 (refs.). L. A. Jones, V. C. Hall and R. M. Briggs, this journal, 14, p. 223; 1927 (refs.).

Alphen, H. C. v.

H. C. v. Alphen, Ann. der Phys., 85, p. 1058; 1928.

Anderson, Jr., W. T.

W. T. Anderson, Jr., H. D. Frazer, and L. F. Bird, this journal, 17, p. 454; 1928.

Baker, E. A.

E. A. Baker, loc. cit.

Baly, E. C. C.

E. C. C. Baly, Spectroscopy, 2, p. 380.

Bates, F.

F. Bates, Phil. Mag., 39, p. 353, 1920; Bull. Bur. Stds., 16, p. 45; 1920.

Bird, L. F.

W. T. Anderson, Jr., H. D. Frazer, and L. F. Bird, this journal, 17, p. 454; 1928.

Bloch, O.

O. Bloch and H. Horton, Phot. Jour., 68, p. 352; 1928.

Bovie, E. T.

E. T. Bovie, this journal, 7, p. 1026; 1923.

Brentano, J.

J. Brentano, Nature, Dec. 22, 1921; Phil. Mag. 7, 685; 1929. Rosenberg, ZS. für Phys., 7, p. 18; 1921. C. E. Wynn-Williams, Phil. Mag., 6, p. 324, 1928; Proc. Camb. Phil. Soc., 23, p. 811, 1927. A. Marcus, Phys. Rev., 31, p. 302; 1928. J. Razek and P. J. Mulder, P. Rev., 33, p. 284; 1929.

Briggs, R. M.

M. L. Dundon, A. L. Schoen, and R. M. Briggs, this journal, 12, p. 397; 1926.Spectroscopy, E.C.C. Baly, Longmans, 2, p. 357; 1927.H. Babcock, Amer. Phys. Soc. meeting, Berkeley, June 1929.

Brush, C. F.

C. F. Brush, Brit. Jour. Phot., 57, p. 781, 1910; Phys. Rev., 31, p. 241, 1910.

Burger, H. C.

W. H. J. Moll and H. C. Burger, Phil. Mag., 50, p. 624, 1925. ZS. für Phys., 34, p. 109. 1925.J. Taylor, The Wireless Eng., p. 627; Oct. 1927.

Clark, W.

W. Clark, Phot. Jour., 65, p. 76; 1925.

Coblentz, W. W.

W. W. Coblentz, Bull. Bur. Stds., 4, p. 392, 1908; 9, p. 7, 1911; 11, p. 132, 1914; 12, p. 504, 1916; this journal, 7, p. 439, 1923; 5, p. 259, 1921. W. H. J. Moll and H. C. Burger, Phil Mag., 50, p. 618, 1925; 50, p. 626, 1925. ZS. für Phys., 34; p. 112, 1925; Rev. d'Opt., 4, p. 562, 1925.

Ditchburn, R. W.

R. W. Ditchburn, Camb. Phil. Soc. Proc., 23, p. 959; 1927.

Dobson, G. M. B.

Photographic Photometry, by G. M. B. Dobson, I. O. Griffith, and D. N. Harrison, Oxford, University Press, p. 121; 1926.

G. M. B. Dobson, Proc. Roy. Soc., 104, p. 248; 1923.

Dorgelo, H. B.

H. B. Dorgelo, Phys. ZS., 26, p. 767; 1925.

H. B. Dorgelo. Phys. ZS., 26, p. 756; 1925.

H. B. Dorgelo, Diss. Utrecht, 1924. R. Frerichs, ZS. f. Phys., 31, p. 305; 1925.

H. B. Dorgelo, Phys. ZS., 26, p. 790; 1925.

Dundon, M. L.

M. L. Dundon, A. L. Schoen, and R. M. Briggs, this journal, 12, p. 397; 1926.Spectroscopy, E.C.C. Baly, Longmans, 2, p. 357; 1927.H. Babcock, Amer. Phys. Soc. meeting, Berkeley, June 1929.

Eagle, A.

A. Eagle, Astrophys. Jour., 31, p. 120; 1910.

Engwicht, H.

G. R. Harrison and H. Engwicht, this journal, 18, p. 287; 1929. (See also refs. 17, 18, 20, and 38.)

Ewest, H.

H. Ewest, Beitrage zur Quantitativen Spectralphotographie. Abstract in English by F. F. Renwick, Phot. Jour., 54, p. 99; 1914. Slade and Toy, Proc. Roy. Soc., 97, p. 181; 1920. T. R. Merton, Proc. Roy. Soc., 99, p. 78; 1921. A. L. Narayan, Phil. Mag., 43, p. 662; 1922. H. H. Plaskett, Dom Ast. Obs. Pub., 2, p. 213; 1923.R. Frerichs, ZS. für Phys., 35, p. 524; 1926.H. M. Kellner, ZS. Wiss. Phot., 24, p. 41; 1926.C. Fabry, Phot. Jour., 66, p. 328; 1926. H. Ley and F. Volbert, ZS. Phys. Chem., 130, p. 308; 1927. H. v. Alband and J. Eisenbrand, Proc. Roy. Soc., 116, p. 153, 1927; ZS. Wiss Phot., 25, p. 138, 1928. C. H. Payne and F. S. Hogg, Proc. Nat. Acad. Sci., 14, p. 88; 1928. L. Lobel and J. Lefevre, Rev. d’Opt., 6, p. 377; 1927. J. K. Robertson, this journal, 7, p. 983; 1923. K. Schachtschabel, Ann. der Phys., 81, 929; 1926.I. Wynekin, Ann. der Phys., 86, p. 1071; 1928. Baly, Morton and Rinding, Proc. Roy. Soc., 113, p. 709; 1927. K. Schaum, ZS. Wiss. Phot., 22, p. 148; 1923.

Farnsworth, A. H.

J. A. Parkhurst and A. H. Farnsworth, Astrophys. Jour., 62, p. 179; 1925. C. Davidson, J.S.I., 5, p. 238; 1928.

Forbes, G. S.

G. R. Harrison and G. S. Forbes, this journal, 10, p. 1; 1925. Forbes and Harrison, this journal, 11, p. 99; 1925. D. C. Stockbarger, this journal, 14, p. 356; 1927.

Forsythe, W. E.

W. E. Forsythe, this journal, 16, p. 307; 1928.

W. E. Forsythe, this journal, 10, p. 19, 1925; 5, p. 494; 1921. C. O. Fairchild and W. E. Hoover, this journal, 7, p. 542; 1923.

Foster, J. S.

J. S. Foster, this journal, 8, p. 373; 1924 Nicholson and Merton, Phil. Trans., 216, p. 459; 1916.I. O. Griffith, Proc. Phys. Soc. Lond., 38, p. 85; 1925.

Frazer, H. D.

W. T. Anderson, Jr., H. D. Frazer, and L. F. Bird, this journal, 17, p. 454; 1928.

Frerichs, R.

R. Frerichs, Ann. der Phys., 386, p. 813; 1926.

Gelhoff, G.

G. Gelhoff, ZS. für Techn. Phys., 1, p. 224; 1920. J. Franck and W. Grotrian, ZS. für Techn. Phys., 3, p. 195; 1922. D. C. Stockbarger, this journal, 9, p. 237; 1924.

Gibson, K. S.

K. S. Gibson, this journal, 13, p. 267; 1926. T. M. Dahm, this journal, 15, p. 266; 1927. L. A. Jones, this journal, 16, p. 259; 1928.

Griffith, I. O.

Photographic Photometry, by G. M. B. Dobson, I. O. Griffith, and D. N. Harrison, Oxford, University Press, p. 121; 1926.

Hansen, G

G Hansen, Ann. der Phys., 383, p. 558; 1925 R. Frerichs, Ann. der Phys., 386 p. 809; 1925.

Hardy, A. C.

See A. C. Hardy, this journal, 18, p. 96; 1929. K. S. Gibson, this journal, 7, p. 693; 1923.

Harrison, D. N.

Photographic Photometry, by G. M. B. Dobson, I. O. Griffith, and D. N. Harrison, Oxford, University Press, p. 121; 1926.

Harrison, G. R.

G. R. Harrison, this journal, 11, p. 341; 1925.

G. R. Harrison, this journal, in press.

G. R. Harrison and G. S. Forbes, this journal, 10, p. 1; 1925. Forbes and Harrison, this journal, 11, p. 99; 1925. D. C. Stockbarger, this journal, 14, p. 356; 1927.

G. R. Harrison, this journal, 17, p. 389; 1928.

G. R. Harrison, this journal, 18, p. 492; 1929.

G. R. Harrison, Phys. Rev., 24, p. 477, 1924; 25, p. 768, 1925. Harrison and C. E. Hesthal, this journal, 8, p. 471; 1924.

G. R. Harrison and H. Engwicht, this journal, 18, p. 287; 1929. (See also refs. 17, 18, 20, and 38.)

G. R. Harrison, this journal, 10, p. 157; 1925.

G. R. Harrison, this journal, 7, p. 999; 1923.

G. R. Harrison, this journal, 16, p. 63; 1928.

C. E. Hesthal and G. R. Harrison, Bull. Amer. Phys. Soc., Berkeley Meeting, June 1929, Abst. 16.

Hesthal, C. E.

C. E. Hesthal and G. R. Harrison, Bull. Amer. Phys. Soc., Berkeley Meeting, June 1929, Abst. 16.

Horton, H.

O. Bloch and H. Horton, Phot. Jour., 68, p. 352; 1928.

Huse, E.

L. A. Jones and E. Huse, Ioc cit.

Jones, L. A.

L. A. Jones and E. Huse, Ioc cit.

L. A. Jones and O. Sandvik, this journal, 12; p. 401; 1926. P. Lafay, Rev. d'Optique, 7, p. 495; 1928.

L. A. Jones, this journal, 7, p. 231; 1923.

L. A. Jones, this journal, 10, p. 561, 1925; Bull. N.R.C., 61, p. 109; 1927.

L. A. Jones, this journal, 7, p. 231; 1923.

Koch, P. P.

P. P. Koch, Ann. der Phys., 39, p. 705; 1912.

P. P. Koch, Ann. der Phys., 39, p. 705; 1912. Koch and A. S. King, Astrophys. Jour., 39, p. 213; 1914. F. Goos, ZS. für Inst., 41, p. 313, 1921; Phys. ZS., 22, p. 468; 1921. J. O. Perrine, this journal, 8, p. 381; 1924. L. F. Behr, Boston Meeting Opt. Soc. Amer., Oct. 1924. E. A. Baker, Jour. Sci. Inst., p. 345, 1924; Proc. Roy. Soc. Edin., 45, pt. 2. P. P. Koch, ZS. für Inst., 45, p. 294; 1925.F. A. Lindemann and G. M. B. Dobson, Engineering, 122, p. 403; 1926. E. Banty, Rev. d’Opt., 5, p. 404; 1926. F. Goos and P. P. Koch, Phys. ZS., 27, p. 41; 1926.F. Goos and P. P. Koch, ZS. für Phys., 44, p. 855; 1927. Goldschmidt, Meteorolog. ZS., p. 241; 1926. F. C. Toy, Jour. Sci. Inst., 4, p. 369; 1927. Muller, ZS. f. Techn. Phys., p. 154; 1928.

Kurtz, H. F.

H. F. Kurtz, this journal, 13, p. 495; 1926.

Lang, R. J.

R. J. Lang and S. Smith, this journal, 12, p. 523; 1926.

Lewis, S. J.

S. J. Lewis, Jour. Chem. Soc. Trans., 115, p. 312; 1919.

Lyman, T.

T. Lyman, Spectroscopy of the Extreme Ultraviolet. P. R. Gleason, Proc. Nat. Acad. Soc., 15, p. 551; 1929.

T. Lyman, Nature, 112, p. 202; 1922.

Merton, T. R

T. R Merton, Proc. Roy. Soc., 1924.

Merton, T. R.

T. R. Merton, Proc. Roy. Soc., 113, p. 697, 1927; ibid., 106, p. 378, 1924.

T. R. Merton and J. W. Nicholson, Phil. Trans. 217, p. 237; 1917. Merton, ref. 61.

T. R. Merton, Proc. Roy. Soc., 106, p. 378; 1924.

Minnaert, M.

L. S. Ornstein and M. Minnaert, ZS. fur Phys., 43, p. 404; 1927.

L. S. Ornstein and M. Minnaert, ZS. für Phys., 43, p. 404; 1927.

Moll, W. H. J.

W. H. J. Moll and H. C. Burger, Phil. Mag., 50, p. 624, 1925. ZS. für Phys., 34, p. 109. 1925.J. Taylor, The Wireless Eng., p. 627; Oct. 1927.

Nicholson, J. W.

T. R. Merton and J. W. Nicholson, Phil. Trans. 217, p. 237; 1917. Merton, ref. 61.

Nicholson, S. B.

E. Pettit and S. B. Nicholson, loc. cit.

Olpin, A. R.

A. R. Olpin, Amer. Phys. Soc. Proc., Washington meeting, Apr. 1929, Abst. 57. Berkeley Meeting, June 1929, Abst. 17.

Ornstein, L. S.

L. S. Ornstein, Proc. Phys. Soc. Lond, 37; p. 334, 1925. Phys. ZS. 28, p. 688, 1927.

L. S. Ornstein and M. Minnaert, ZS. fur Phys., 43, p. 404; 1927.

L. S. Ornstein, Proc. Phys. Soc. Lond., 37, p. 337; 1925.

L. S. Ornstein and M. Minnaert, ZS. für Phys., 43, p. 404; 1927.

Parkhurst, J. A.

J. A. Parkhurst and A. H. Farnsworth, Astrophys. Jour., 62, p. 179; 1925. C. Davidson, J.S.I., 5, p. 238; 1928.

Pettit, E.

E. Pettit and S. B. Nicholson, loc. cit.

Pfund, A. H.

A. H. Pfund, Jour. Frank. Inst., 192, p. 641; 1922. E. Karrer, this journal, 7, p. 893; 1923.

Ross, F. E.

F. E. Ross, this journal, 4, p. 255; 1920. P. S. Helmick, this journal, 5, p. 336; 1921.

F. E. Ross, Astrophys. Jour., 52; p. 86; 1920.

Sandvik, O.

L. A. Jones and O. Sandvik, this journal, 12; p. 401; 1926. P. Lafay, Rev. d'Optique, 7, p. 495; 1928.

Schoen, A. L.

A. L. Schoen, this ournal, 7, p. 483; 1923. C. B. Bazzoni, R. W. Duncan, and W. S. Mathews, this journal, 7, p. 1003; 1923. F. C. Toy, Proc. Phys. Soc. Lond., 36, p. 432; 1924.Toy and Rawling, Jour. Sci. Inst. 1, p. 362; 1924.J. Kaplan, this journal, 14, p. 251, 1927 (use of thalofide cell).

M. L. Dundon, A. L. Schoen, and R. M. Briggs, this journal, 12, p. 397; 1926.Spectroscopy, E.C.C. Baly, Longmans, 2, p. 357; 1927.H. Babcock, Amer. Phys. Soc. meeting, Berkeley, June 1929.

A. L. Schoen, this journal, 14, p. 179; 1927.

Schumann, V.

V. Schumann, Ann. der Phys., 5, p. 349; 1901.

Schwarzschild, K.

K. Schwarzschild, Astrophys. Jour., 11, p. 89; 1900.

Smith, S.

R. J. Lang and S. Smith, this journal, 12, p. 523; 1926.

Snith, T. T.

T. T. Snith, this journal, 17, p. 145; 1928.

Stetson, H. T.

H. T. Stetson, Astrophys. Jour., 43. pp. 253 and 325; 1916. W. H. J. Moll, Proc. Phys. Soc. Lond., 33, p. 207; 1921. Stetson and Carpenter, Astrophys. Jour., 58, p. 36; 1923. E. Pettit and S. B. Nicholson, this journal, 7, p. 187; 1923. M. Siegbahn, Phil. Mag., 48, p. 217; 1924. G. R. Harrison, loc. cit., 1925. E. Backlin, ZS. für Inst., 47, p. 373; 1927. E. Spiller, ZS. für. Inst., 47, p. 493; 1927. E. A. Harrington, this journal, 16, p. 211; 1928.

van Cittert, P. H.

P. H. van Cittert, Physica, 3, p. 182, 1923; Rev. d’Opt., 2, p. 57, 1923. (or see Ornstein, ref. 4, p. 340, or Dorgelo, ref. 5, p. 771.)

Wadsworth, F.

F. Wadsworth, Astrophys. Jour., 2, 370; 1895. W. F. Meggers, Bur. Stds. Sci. Paper No. 441.

Webster, H. C.

H. C. Webster, Proc. Phys. Soc. Lond., 41, p. 181; 1929 .H. T. Meyer, Wissenschaftliche Veröffentlichung aus dem Siemans-Konzern, 7te Band, 2 Heft, p. 109. A. Bowers, ZS. für Phys., 14, p. 174, 1923; Physica, 3, p. 113, 1923; ibid., 5, p. 8, 1925. Diss. Utrecht 1924. R. Glocker and W. Traub, Phys. ZS. 22, p. 345; 1921.

Weinland, C. E.

C. E. Weinland, this journal, 15, p. 337, 1927; 16, p. 295; 1928. E. A. Baker, Proc. Opt. Conv., part 1, p. 238; 1926. Weber, Ann. der Phys., 45, p. 801; 1914.

C. E. Weinland, this journal, 15, p. 337; 1927.

C. E. Weinland, this journal, 15, p. 337; 1927 (refs.).

Wienland, C. E.

C. E. Wienland, this journal, 15, p. 337; 1927. A. E. Weber, Ann. der Phys., 45, p. 801; 1914.

Wilsey, R. B.

R. B. Wilsey, Eastman Kodak Res. Lab. Comm. No. 239. R. B. Wilsey and H. A. Pritchard, this journal, 12, p. 661; 1926.

Worthing, A. E.

A. E. Worthing, Phys. Rev., 10, p. 377; 1917. Hyde, Cady, and Forsythe, Jour. Frank. Inst., 181, p. 418; 1916.Int. Crit. Tables, 5, pp. 245–246.

Zwikker, C.

C. Zwikker, Diss. Amsterdam 1925. (Dorgelo, Phys. ZS., 26, p. 770; 1925.)

Other (94)

W. W. Coblentz, Bull. Bur. Stds., 4, p. 392, 1908; 9, p. 7, 1911; 11, p. 132, 1914; 12, p. 504, 1916; this journal, 7, p. 439, 1923; 5, p. 259, 1921. W. H. J. Moll and H. C. Burger, Phil Mag., 50, p. 618, 1925; 50, p. 626, 1925. ZS. für Phys., 34; p. 112, 1925; Rev. d'Opt., 4, p. 562, 1925.

W. H. J. Moll and H. C. Burger, Phil. Mag., 50, p. 624, 1925. ZS. für Phys., 34, p. 109. 1925.J. Taylor, The Wireless Eng., p. 627; Oct. 1927.

See A. C. Hardy, this journal, 18, p. 96; 1929. K. S. Gibson, this journal, 7, p. 693; 1923.

L. S. Ornstein, Proc. Phys. Soc. Lond, 37; p. 334, 1925. Phys. ZS. 28, p. 688, 1927.

H. B. Dorgelo. Phys. ZS., 26, p. 756; 1925.

Photographic Photometry, by G. M. B. Dobson, I. O. Griffith, and D. N. Harrison, Oxford, University Press, p. 121; 1926.

F. E. Ross, this journal, 4, p. 255; 1920. P. S. Helmick, this journal, 5, p. 336; 1921.

See Investigations on the Theory of the Photographic Process, S. E. Sheppard and C. E. K. Mees, Longmans, 1907.

F. E. Ross, Astrophys. Jour., 52; p. 86; 1920.

K. Schwarzschild, Astrophys. Jour., 11, p. 89; 1900.

W. de W. Abney, Phot. Jour., 18, p. 302; 1893–4. L. A. Jones and E. Huse, this journal, 7, p. 1079, 1923 (refs.). L. A. Jones, V. C. Hall and R. M. Briggs, this journal, 14, p. 223; 1927 (refs.).

L. A. Jones and E. Huse, Ioc cit.

G. R. Harrison, this journal, 11, p. 341; 1925.

L. A. Jones and O. Sandvik, this journal, 12; p. 401; 1926. P. Lafay, Rev. d'Optique, 7, p. 495; 1928.

A. Eagle, Astrophys. Jour., 31, p. 120; 1910.

F. Wadsworth, Astrophys. Jour., 2, 370; 1895. W. F. Meggers, Bur. Stds. Sci. Paper No. 441.

G. R. Harrison, this journal, 17, p. 389; 1928.

C. E. Weinland, this journal, 15, p. 337; 1927 (refs.).

G. R. Harrison and G. S. Forbes, this journal, 10, p. 1; 1925. Forbes and Harrison, this journal, 11, p. 99; 1925. D. C. Stockbarger, this journal, 14, p. 356; 1927.

E. T. Bovie, this journal, 7, p. 1026; 1923.

G. R. Harrison, Phys. Rev., 24, p. 477, 1924; 25, p. 768, 1925. Harrison and C. E. Hesthal, this journal, 8, p. 471; 1924.

R. W. Ditchburn, Camb. Phil. Soc. Proc., 23, p. 959; 1927.

Ham, Fehr, and Bitner, Jour. Frank. Inst., 178, p. 299; 1914.

G. R. Harrison, this journal, 18, p. 492; 1929.

L. S. Ornstein, Proc. Phys. Soc. Lond., 37, p. 337; 1925.

H. B. Dorgelo, Diss. Utrecht, 1924. R. Frerichs, ZS. f. Phys., 31, p. 305; 1925.

A. H. Pfund, Jour. Frank. Inst., 192, p. 641; 1922. E. Karrer, this journal, 7, p. 893; 1923.

T. R. Merton, Proc. Roy. Soc., 106, p. 378; 1924.

K. S. Gibson, this journal, 13, p. 267; 1926. T. M. Dahm, this journal, 15, p. 266; 1927. L. A. Jones, this journal, 16, p. 259; 1928.

L. S. Ornstein and M. Minnaert, ZS. fur Phys., 43, p. 404; 1927.

W. E. Forsythe, this journal, 16, p. 307; 1928.

R. Frerichs, Ann. der Phys., 386, p. 813; 1926.

G. R. Harrison, this journal, in press.

H. B. Dorgelo, Phys. ZS., 26, p. 767; 1925.

W. E. Forsythe, this journal, 10, p. 19, 1925; 5, p. 494; 1921. C. O. Fairchild and W. E. Hoover, this journal, 7, p. 542; 1923.

A. E. Worthing, Phys. Rev., 10, p. 377; 1917. Hyde, Cady, and Forsythe, Jour. Frank. Inst., 181, p. 418; 1916.Int. Crit. Tables, 5, pp. 245–246.

C. Zwikker, Diss. Amsterdam 1925. (Dorgelo, Phys. ZS., 26, p. 770; 1925.)

G. Gelhoff, ZS. für Techn. Phys., 1, p. 224; 1920. J. Franck and W. Grotrian, ZS. für Techn. Phys., 3, p. 195; 1922. D. C. Stockbarger, this journal, 9, p. 237; 1924.

H. C. v. Alphen, Ann. der Phys., 85, p. 1058; 1928.

P. H. van Cittert, Physica, 3, p. 182, 1923; Rev. d’Opt., 2, p. 57, 1923. (or see Ornstein, ref. 4, p. 340, or Dorgelo, ref. 5, p. 771.)

W. T. Anderson, Jr., H. D. Frazer, and L. F. Bird, this journal, 17, p. 454; 1928.

H. F. Kurtz, this journal, 13, p. 495; 1926.

Dorgelo, ref. 5, p. 771.

G. R. Harrison and H. Engwicht, this journal, 18, p. 287; 1929. (See also refs. 17, 18, 20, and 38.)

F. Bates, Phil. Mag., 39, p. 353, 1920; Bull. Bur. Stds., 16, p. 45; 1920.

O. Bloch and H. Horton, Phot. Jour., 68, p. 352; 1928.

W. Clark, Phot. Jour., 65, p. 76; 1925.

C. F. Brush, Brit. Jour. Phot., 57, p. 781, 1910; Phys. Rev., 31, p. 241, 1910.

C. E. Wienland, this journal, 15, p. 337; 1927. A. E. Weber, Ann. der Phys., 45, p. 801; 1914.

L. A. Jones, this journal, 7, p. 231; 1923.

G. R. Harrison, this journal, 10, p. 157; 1925.

H. T. Stetson, Astrophys. Jour., 43. pp. 253 and 325; 1916. W. H. J. Moll, Proc. Phys. Soc. Lond., 33, p. 207; 1921. Stetson and Carpenter, Astrophys. Jour., 58, p. 36; 1923. E. Pettit and S. B. Nicholson, this journal, 7, p. 187; 1923. M. Siegbahn, Phil. Mag., 48, p. 217; 1924. G. R. Harrison, loc. cit., 1925. E. Backlin, ZS. für Inst., 47, p. 373; 1927. E. Spiller, ZS. für. Inst., 47, p. 493; 1927. E. A. Harrington, this journal, 16, p. 211; 1928.

E. Pettit and S. B. Nicholson, loc. cit.

G. R. Harrison, this journal, 7, p. 999; 1923.

G. R. Harrison, this journal, 16, p. 63; 1928.

P. P. Koch, Ann. der Phys., 39, p. 705; 1912. Koch and A. S. King, Astrophys. Jour., 39, p. 213; 1914. F. Goos, ZS. für Inst., 41, p. 313, 1921; Phys. ZS., 22, p. 468; 1921. J. O. Perrine, this journal, 8, p. 381; 1924. L. F. Behr, Boston Meeting Opt. Soc. Amer., Oct. 1924. E. A. Baker, Jour. Sci. Inst., p. 345, 1924; Proc. Roy. Soc. Edin., 45, pt. 2. P. P. Koch, ZS. für Inst., 45, p. 294; 1925.F. A. Lindemann and G. M. B. Dobson, Engineering, 122, p. 403; 1926. E. Banty, Rev. d’Opt., 5, p. 404; 1926. F. Goos and P. P. Koch, Phys. ZS., 27, p. 41; 1926.F. Goos and P. P. Koch, ZS. für Phys., 44, p. 855; 1927. Goldschmidt, Meteorolog. ZS., p. 241; 1926. F. C. Toy, Jour. Sci. Inst., 4, p. 369; 1927. Muller, ZS. f. Techn. Phys., p. 154; 1928.

A. R. Olpin, Amer. Phys. Soc. Proc., Washington meeting, Apr. 1929, Abst. 57. Berkeley Meeting, June 1929, Abst. 17.

P. P. Koch, Ann. der Phys., 39, p. 705; 1912.

E. A. Baker, loc. cit.

G. M. B. Dobson, Proc. Roy. Soc., 104, p. 248; 1923.

C. E. Hesthal and G. R. Harrison, Bull. Amer. Phys. Soc., Berkeley Meeting, June 1929, Abst. 16.

J. Brentano, Nature, Dec. 22, 1921; Phil. Mag. 7, 685; 1929. Rosenberg, ZS. für Phys., 7, p. 18; 1921. C. E. Wynn-Williams, Phil. Mag., 6, p. 324, 1928; Proc. Camb. Phil. Soc., 23, p. 811, 1927. A. Marcus, Phys. Rev., 31, p. 302; 1928. J. Razek and P. J. Mulder, P. Rev., 33, p. 284; 1929.

T. T. Snith, this journal, 17, p. 145; 1928.

A. L. Schoen, this ournal, 7, p. 483; 1923. C. B. Bazzoni, R. W. Duncan, and W. S. Mathews, this journal, 7, p. 1003; 1923. F. C. Toy, Proc. Phys. Soc. Lond., 36, p. 432; 1924.Toy and Rawling, Jour. Sci. Inst. 1, p. 362; 1924.J. Kaplan, this journal, 14, p. 251, 1927 (use of thalofide cell).

G Hansen, Ann. der Phys., 383, p. 558; 1925 R. Frerichs, Ann. der Phys., 386 p. 809; 1925.

J. S. Foster, this journal, 8, p. 373; 1924 Nicholson and Merton, Phil. Trans., 216, p. 459; 1916.I. O. Griffith, Proc. Phys. Soc. Lond., 38, p. 85; 1925.

T. R Merton, Proc. Roy. Soc., 1924.

J. A. Parkhurst and A. H. Farnsworth, Astrophys. Jour., 62, p. 179; 1925. C. Davidson, J.S.I., 5, p. 238; 1928.

L. S. Ornstein and M. Minnaert, ZS. für Phys., 43, p. 404; 1927.

T. R. Merton and J. W. Nicholson, Phil. Trans. 217, p. 237; 1917. Merton, ref. 61.

T. R. Merton, Proc. Roy. Soc., 113, p. 697, 1927; ibid., 106, p. 378, 1924.

T. Abe, Mazda Kenkyu-Jiho, 3, p. 325; 1928. (In English.)

Catalogs of Adam Hilger, Ltd. V. Henri, Etudes de Photochimie, Paris, Gauthier-Villars, 1919. H. E. Howe, Phys. Rev., 8, p. 674; 1916. H. J. McNicholas, Bur. Stds. Jour. Res., 1, p. 939; 1928. Sci. Papers Bur. Stds., No. 440; 18, p. 121; 1922.V. Hardung, Helv. Phys. Acta, 1, p. 472; 1928. Proc. Roy. Soc. Lond, 120, p. 21; 928.

C. E. Weinland, this journal, 15, p. 337, 1927; 16, p. 295; 1928. E. A. Baker, Proc. Opt. Conv., part 1, p. 238; 1926. Weber, Ann. der Phys., 45, p. 801; 1914.

Bur. Stds. Sci. Paper No. 440.

C. E. Weinland, this journal, 15, p. 337; 1927.

S. J. Lewis, Jour. Chem. Soc. Trans., 115, p. 312; 1919.

L. A. Jones, this journal, 10, p. 561, 1925; Bull. N.R.C., 61, p. 109; 1927.

H. Ewest, Beitrage zur Quantitativen Spectralphotographie. Abstract in English by F. F. Renwick, Phot. Jour., 54, p. 99; 1914. Slade and Toy, Proc. Roy. Soc., 97, p. 181; 1920. T. R. Merton, Proc. Roy. Soc., 99, p. 78; 1921. A. L. Narayan, Phil. Mag., 43, p. 662; 1922. H. H. Plaskett, Dom Ast. Obs. Pub., 2, p. 213; 1923.R. Frerichs, ZS. für Phys., 35, p. 524; 1926.H. M. Kellner, ZS. Wiss. Phot., 24, p. 41; 1926.C. Fabry, Phot. Jour., 66, p. 328; 1926. H. Ley and F. Volbert, ZS. Phys. Chem., 130, p. 308; 1927. H. v. Alband and J. Eisenbrand, Proc. Roy. Soc., 116, p. 153, 1927; ZS. Wiss Phot., 25, p. 138, 1928. C. H. Payne and F. S. Hogg, Proc. Nat. Acad. Sci., 14, p. 88; 1928. L. Lobel and J. Lefevre, Rev. d’Opt., 6, p. 377; 1927. J. K. Robertson, this journal, 7, p. 983; 1923. K. Schachtschabel, Ann. der Phys., 81, 929; 1926.I. Wynekin, Ann. der Phys., 86, p. 1071; 1928. Baly, Morton and Rinding, Proc. Roy. Soc., 113, p. 709; 1927. K. Schaum, ZS. Wiss. Phot., 22, p. 148; 1923.

M. L. Dundon, A. L. Schoen, and R. M. Briggs, this journal, 12, p. 397; 1926.Spectroscopy, E.C.C. Baly, Longmans, 2, p. 357; 1927.H. Babcock, Amer. Phys. Soc. meeting, Berkeley, June 1929.

A. L. Schoen, this journal, 14, p. 179; 1927.

Corning Glass Works, Catalog of Ultraviolet Glasses.

I. C. T. 5, p. 335. R. W. Wood, Physical Optics, MacMillan.

T. Lyman, Spectroscopy of the Extreme Ultraviolet. P. R. Gleason, Proc. Nat. Acad. Soc., 15, p. 551; 1929.

R. J. Lang and S. Smith, this journal, 12, p. 523; 1926.

V. Schumann, Ann. der Phys., 5, p. 349; 1901.

E. C. C. Baly, Spectroscopy, 2, p. 380.

Duclaux and Jeantet, Jour. de Phys. et Le Rad., 2, p. 154; 1921.

Ibid. G. R. Harrison, this journal, 11, p. 113; 1925.

T. Lyman, Nature, 112, p. 202; 1922.

R. B. Wilsey, Eastman Kodak Res. Lab. Comm. No. 239. R. B. Wilsey and H. A. Pritchard, this journal, 12, p. 661; 1926.

H. C. Webster, Proc. Phys. Soc. Lond., 41, p. 181; 1929 .H. T. Meyer, Wissenschaftliche Veröffentlichung aus dem Siemans-Konzern, 7te Band, 2 Heft, p. 109. A. Bowers, ZS. für Phys., 14, p. 174, 1923; Physica, 3, p. 113, 1923; ibid., 5, p. 8, 1925. Diss. Utrecht 1924. R. Glocker and W. Traub, Phys. ZS. 22, p. 345; 1921.

L. A. Jones, this journal, 7, p. 231; 1923.

H. B. Dorgelo, Phys. ZS., 26, p. 790; 1925.

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