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  1. The reflection and the transmission factors for light are formally defined by the Illuminating Engineering Society (Rep. of Com. on Nomenclature and Standards, 1918). The terms are here used in accordance with these definitions, with the understanding, however, that they are determined under conditions of diffused light. Other symbols used in this article conform also with the I. E. S. nomenclature.
  2. Ann. d. Phys., 316, p. 996; 1903. Good for reference to earlier work pertaining to Lambert's law. See also in this connection Mascart Traite D'Optique, Vol. 3, p. 213.
  3. Loc. cit., p. 1006, Table I. (There appears to be a typographical error here in the record of angles.)
  4. "The Diffusion of Light," Phil. Mag., 35, p. 81; 1893.
  5. "The Integrating Photometric Sphere, Its Construction and Use," Tr. I. E. S., 2, p. 453; 1916.
  6. "The Light Reflecting Values of White and Colored Paints," J. F. I., 181, p. 99; 1916.
  7. Tr. I. E. S., Vol. 7, P. 412; 1912.[J. O. S. A., V.
  8. "Measurement of the Reflection Factor," Elec. World, Vol. 69, p. 958; 1917.
  9. "Measurement of Diffuse Reflection Factors," Jour. Am. Opt. Soc., 4, p. 9; 1920. Also B. S. Sci. Papers, No. 391 and No. 405.
  10. Loc. cit., p. 16.
  11. G. E. Rev., 23, p. 72; 1920.
  12. "A Simple Portable Reflectometer," A. H. Taylor, Tr., I. E. S. Paper read at Fourteenth Annual Convention of I. E. S., 1920. Also B. Sci. Papers, No. 405.
  13. B. S. Bulletin, Vol. 7, p. 553; 1910.
  14. B. S. Bulletin, Vol. 6, p. 551; 1910.
  15. B. S. Bulletin, Vol. 6, P. 558; 1910.
  16. B. S. Bulletin, Vol. 6, No. 4, P. 562.
  17. Liebenthal, Praktische Photometrie, p. 301.
  18. Electroteknische Zeit., 21, p. 595; 1900, and 26, p. 512; 1905.
  19. Palaz, "Traite de Photométrie Industrièlle," Trans, by the Pattersons, p. 297.
  20. This reflectometer was shown before the Illuminating Engineering Society at Cleveland, Oct. 5, 1920. A general description of it will appear in Trans. I. E. S., as discussion of the papers: "Measurement of Reflection Factor," C. H. Sharp and W. F. Little; and "A Simple Portable Reflectometer of the Absolute Type," A. H. Taylor.
  21. Physikalische Zeitschrift, Vol. 1, pp. 299–303; 1900.
  22. It is to be regretted that this instrument is not more readily procurable.
  23. B. S. Sci. Papers, in press, "The Integrating Sphere," Rosa and Taylor.
  24. A. H. Taylor: "Measurement of Diffuse Reflection Factors and a New Absolute Refiectometer," Jour. Am. Op. Soc, Vol. 4, No. 1, p. 9; 1920. 25 F. A. Benford: "An Absolute Method for Determining Coefficients of Diffuse Reflection," Gen. Elec. Rev., Vol. 23, p. 72; 1920.
  25. F. A. Benford: "An Absolute Method for Determining Coefficients of Diffuse Reflection," Gen. Elec. Rev., Vol. 23, p. 72; I920.
  26. C. H. Sharp and W. F. Little: "Measurement of Reflection Factors," Trans. I. E. S. Paper read at Fourteenth Annual Convention, I. E. S., 1920. See also paper by Mr. A. H. Taylor, presented at the same time; and discussion by Karrer.
  27. A. H. Taylor finds this angle to be about 50° for many surfaces. Prof. W. J. Drisko informs me that he has found the angle to be about 46° for many surfaces.
  28. Photographische Korrespondenz, May-June, 1910. Densograph, ein Registrierapparat zur Messung der Schwarrzung photographischer Platten.

Benford, F. A.

F. A. Benford: "An Absolute Method for Determining Coefficients of Diffuse Reflection," Gen. Elec. Rev., Vol. 23, p. 72; I920.

Bulletin, B. S.

B. S. Bulletin, Vol. 6, P. 558; 1910.

B. S. Bulletin, Vol. 7, p. 553; 1910.

B. S. Bulletin, Vol. 6, No. 4, P. 562.

B. S. Bulletin, Vol. 6, p. 551; 1910.

Little, W. F.

C. H. Sharp and W. F. Little: "Measurement of Reflection Factors," Trans. I. E. S. Paper read at Fourteenth Annual Convention, I. E. S., 1920. See also paper by Mr. A. H. Taylor, presented at the same time; and discussion by Karrer.

Sharp, C. H.

C. H. Sharp and W. F. Little: "Measurement of Reflection Factors," Trans. I. E. S. Paper read at Fourteenth Annual Convention, I. E. S., 1920. See also paper by Mr. A. H. Taylor, presented at the same time; and discussion by Karrer.

Taylor, A. H.

A. H. Taylor: "Measurement of Diffuse Reflection Factors and a New Absolute Refiectometer," Jour. Am. Op. Soc, Vol. 4, No. 1, p. 9; 1920. 25 F. A. Benford: "An Absolute Method for Determining Coefficients of Diffuse Reflection," Gen. Elec. Rev., Vol. 23, p. 72; 1920.

A. H. Taylor finds this angle to be about 50° for many surfaces. Prof. W. J. Drisko informs me that he has found the angle to be about 46° for many surfaces.

Other

The reflection and the transmission factors for light are formally defined by the Illuminating Engineering Society (Rep. of Com. on Nomenclature and Standards, 1918). The terms are here used in accordance with these definitions, with the understanding, however, that they are determined under conditions of diffused light. Other symbols used in this article conform also with the I. E. S. nomenclature.

Ann. d. Phys., 316, p. 996; 1903. Good for reference to earlier work pertaining to Lambert's law. See also in this connection Mascart Traite D'Optique, Vol. 3, p. 213.

Loc. cit., p. 1006, Table I. (There appears to be a typographical error here in the record of angles.)

"The Diffusion of Light," Phil. Mag., 35, p. 81; 1893.

"The Integrating Photometric Sphere, Its Construction and Use," Tr. I. E. S., 2, p. 453; 1916.

"The Light Reflecting Values of White and Colored Paints," J. F. I., 181, p. 99; 1916.

Tr. I. E. S., Vol. 7, P. 412; 1912.[J. O. S. A., V.

"Measurement of the Reflection Factor," Elec. World, Vol. 69, p. 958; 1917.

"Measurement of Diffuse Reflection Factors," Jour. Am. Opt. Soc., 4, p. 9; 1920. Also B. S. Sci. Papers, No. 391 and No. 405.

Loc. cit., p. 16.

G. E. Rev., 23, p. 72; 1920.

"A Simple Portable Reflectometer," A. H. Taylor, Tr., I. E. S. Paper read at Fourteenth Annual Convention of I. E. S., 1920. Also B. Sci. Papers, No. 405.

B. S. Bulletin, Vol. 7, p. 553; 1910.

B. S. Bulletin, Vol. 6, p. 551; 1910.

B. S. Bulletin, Vol. 6, P. 558; 1910.

B. S. Bulletin, Vol. 6, No. 4, P. 562.

Liebenthal, Praktische Photometrie, p. 301.

Electroteknische Zeit., 21, p. 595; 1900, and 26, p. 512; 1905.

Palaz, "Traite de Photométrie Industrièlle," Trans, by the Pattersons, p. 297.

This reflectometer was shown before the Illuminating Engineering Society at Cleveland, Oct. 5, 1920. A general description of it will appear in Trans. I. E. S., as discussion of the papers: "Measurement of Reflection Factor," C. H. Sharp and W. F. Little; and "A Simple Portable Reflectometer of the Absolute Type," A. H. Taylor.

Physikalische Zeitschrift, Vol. 1, pp. 299–303; 1900.

It is to be regretted that this instrument is not more readily procurable.

B. S. Sci. Papers, in press, "The Integrating Sphere," Rosa and Taylor.

A. H. Taylor: "Measurement of Diffuse Reflection Factors and a New Absolute Refiectometer," Jour. Am. Op. Soc, Vol. 4, No. 1, p. 9; 1920. 25 F. A. Benford: "An Absolute Method for Determining Coefficients of Diffuse Reflection," Gen. Elec. Rev., Vol. 23, p. 72; 1920.

F. A. Benford: "An Absolute Method for Determining Coefficients of Diffuse Reflection," Gen. Elec. Rev., Vol. 23, p. 72; I920.

C. H. Sharp and W. F. Little: "Measurement of Reflection Factors," Trans. I. E. S. Paper read at Fourteenth Annual Convention, I. E. S., 1920. See also paper by Mr. A. H. Taylor, presented at the same time; and discussion by Karrer.

A. H. Taylor finds this angle to be about 50° for many surfaces. Prof. W. J. Drisko informs me that he has found the angle to be about 46° for many surfaces.

Photographische Korrespondenz, May-June, 1910. Densograph, ein Registrierapparat zur Messung der Schwarrzung photographischer Platten.

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