Abstract

The wave-lengths of 26 visible and ultraviolet radiations from <sup>198</sup><sub>80</sub>Hg have been measured to eight figures relative to 5460.7532A, provisionally adopted for the green line. A water-cooled electrodeless lamp containing two milligrams of artificial <sup>198</sup><sub>80</sub>Hg served as a light source when excited with radio waves of 100 Mc frequency.This lamp illuminated a Fabry-Perot interferometer and a large quartz spectrograph with which the interference patterns were photographed. Measurements of these patterns yielded relative wave-lengths with probable errors usually less than 0.0001A. In addition to demonstrating that <sup>198</sup><sub>80</sub>Hg 5460.7532A provides a practically perfect primary standard of length, this paper presents preliminary values of 27 superior spectroscopic standards which show that differences among vacuum wave numbers recur within the accuracy of the measurements, and that all the existing dispersion curves for air are incorrect.

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  1. W. F. Meggers, J. Opt. Soc. Am. 38, 7 (1948).
  2. W. F. Meggers, Comptes Rendus des Séances, Neuvième Conférence Générale des Poids et Mesures, 1948, 75.
  3. H. Barrell and J. Puttock, Comptes Rendus des Séances Neuvième Conférence Générale des Poids et Mesures, 1948, 77.
  4. A. Perard and J. Terrien, Comptes Rendus 228, 964 (1949).
  5. W. F. Meggers and F. O. Westfall, J. Research, Nat. Bur. Stand. 44, 447 (1950).
  6. J. M. Blank, J. Opt. Soc. Am. 40, 345 (1950).
  7. C. Fabry and H. Buisson, Astrophys. J. 28, 169 (1908).
  8. W. F. Meggers and C. J. Humphreys, J. Research Nat. Bur. Stand. 18, 543 (1937).
  9. F. H. Rolt and H. Barrell, Proc. Roy. Soc. A122, 122 (1929).
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  11. G. R. Harrison, M.I.T. Wave-length Tables (John Wiley and Sons, Inc., New York).
  12. W. F. Meggers and C. G. Peters, Bur. Stand. Sci. Papers 14, 724 (1918).
  13. H. Kayser and C. Runge, Wiedem. Ann. 52, 93 (1894).
  14. W. F. Meggers, Astrophys. J. 60, 60 (1924).
  15. K. Burns, J. Opt. Soc. Am. and Rev. Sci. Inst. 11, 301 (1925).
  16. J. E. Sears and H. Barrell, Phil. Trans. Roy. Soc. (London) A238, 1 (1939).
  17. A. Pérard, Trans. Bur. int. Poids et Mesures 19, 78 (1934).
  18. W. Kösters and P. Lampe, Physik. Zeits. 35, 223 (1934).

Barrell, H.

H. Barrell and J. Puttock, Comptes Rendus des Séances Neuvième Conférence Générale des Poids et Mesures, 1948, 77.

J. E. Sears and H. Barrell, Phil. Trans. Roy. Soc. (London) A238, 1 (1939).

F. H. Rolt and H. Barrell, Proc. Roy. Soc. A122, 122 (1929).

Blank, J. M.

J. M. Blank, J. Opt. Soc. Am. 40, 345 (1950).

Buisson, H.

C. Fabry and H. Buisson, Astrophys. J. 28, 169 (1908).

Burns, K.

K. Burns, J. Opt. Soc. Am. and Rev. Sci. Inst. 11, 301 (1925).

Fabry, C.

C. Fabry and H. Buisson, Astrophys. J. 28, 169 (1908).

Harrison, G. R.

G. R. Harrison, M.I.T. Wave-length Tables (John Wiley and Sons, Inc., New York).

Humphreys, C. J.

W. F. Meggers and C. J. Humphreys, J. Research Nat. Bur. Stand. 18, 543 (1937).

Kayser, H.

H. Kayser and C. Runge, Wiedem. Ann. 52, 93 (1894).

Kösters, W.

W. Kösters and P. Lampe, Physik. Zeits. 35, 223 (1934).

Lampe, P.

W. Kösters and P. Lampe, Physik. Zeits. 35, 223 (1934).

Meggers, W. F.

W. F. Meggers, J. Opt. Soc. Am. 38, 7 (1948).

W. F. Meggers, Astrophys. J. 60, 60 (1924).

W. F. Meggers and C. G. Peters, Bur. Stand. Sci. Papers 14, 724 (1918).

W. F. Meggers and F. O. Westfall, J. Research, Nat. Bur. Stand. 44, 447 (1950).

W. F. Meggers and C. J. Humphreys, J. Research Nat. Bur. Stand. 18, 543 (1937).

W. F. Meggers, Comptes Rendus des Séances, Neuvième Conférence Générale des Poids et Mesures, 1948, 75.

W. F. Meggers, Sci. Monthly 68, 3 (1949).

Perard, A.

A. Perard and J. Terrien, Comptes Rendus 228, 964 (1949).

Pérard, A.

A. Pérard, Trans. Bur. int. Poids et Mesures 19, 78 (1934).

Peters, C. G.

W. F. Meggers and C. G. Peters, Bur. Stand. Sci. Papers 14, 724 (1918).

Puttock, J.

H. Barrell and J. Puttock, Comptes Rendus des Séances Neuvième Conférence Générale des Poids et Mesures, 1948, 77.

Rolt, F. H.

F. H. Rolt and H. Barrell, Proc. Roy. Soc. A122, 122 (1929).

Runge, C.

H. Kayser and C. Runge, Wiedem. Ann. 52, 93 (1894).

Sears, J. E.

J. E. Sears and H. Barrell, Phil. Trans. Roy. Soc. (London) A238, 1 (1939).

Terrien, J.

A. Perard and J. Terrien, Comptes Rendus 228, 964 (1949).

Westfall, F. O.

W. F. Meggers and F. O. Westfall, J. Research, Nat. Bur. Stand. 44, 447 (1950).

Other

W. F. Meggers, J. Opt. Soc. Am. 38, 7 (1948).

W. F. Meggers, Comptes Rendus des Séances, Neuvième Conférence Générale des Poids et Mesures, 1948, 75.

H. Barrell and J. Puttock, Comptes Rendus des Séances Neuvième Conférence Générale des Poids et Mesures, 1948, 77.

A. Perard and J. Terrien, Comptes Rendus 228, 964 (1949).

W. F. Meggers and F. O. Westfall, J. Research, Nat. Bur. Stand. 44, 447 (1950).

J. M. Blank, J. Opt. Soc. Am. 40, 345 (1950).

C. Fabry and H. Buisson, Astrophys. J. 28, 169 (1908).

W. F. Meggers and C. J. Humphreys, J. Research Nat. Bur. Stand. 18, 543 (1937).

F. H. Rolt and H. Barrell, Proc. Roy. Soc. A122, 122 (1929).

W. F. Meggers, Sci. Monthly 68, 3 (1949).

G. R. Harrison, M.I.T. Wave-length Tables (John Wiley and Sons, Inc., New York).

W. F. Meggers and C. G. Peters, Bur. Stand. Sci. Papers 14, 724 (1918).

H. Kayser and C. Runge, Wiedem. Ann. 52, 93 (1894).

W. F. Meggers, Astrophys. J. 60, 60 (1924).

K. Burns, J. Opt. Soc. Am. and Rev. Sci. Inst. 11, 301 (1925).

J. E. Sears and H. Barrell, Phil. Trans. Roy. Soc. (London) A238, 1 (1939).

A. Pérard, Trans. Bur. int. Poids et Mesures 19, 78 (1934).

W. Kösters and P. Lampe, Physik. Zeits. 35, 223 (1934).

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