F. C. Breckenridge and W. R. Schaub, “Rectangular Uniform-Chromaticity-Scale Coordinates,” Abstract No. 14, J. O. S. A. 27, 226 (1937).

R. H. Sinden, “Further Search for the Ideal Color System, I,” J. O. S. A. 27, 124 (1937).

[CrossRef]

D. B. Judd, “Estimation of Chromaticity Differences and Nearest Color Temperature on the Standard 1931 I. C. I. Colorimetric Coordinate System,” J. O. S. A. 26, 421 (1936).

[CrossRef]

D. B. Judd, “A Maxwell Triangle Yielding Uniform Chromaticity Scales,” J. O. S. A. 25, 24 (1935).

[CrossRef]

D. L. MacAdam, “Theory of Maximum Visual Efficiency of Colored Materials,” J. O. S. A. 25, 249 (1935).

[CrossRef]

D. B. Judd, “Reduction of Data on Mixture of Color Stimuli,” Nat. Bur. Stand. J. Research 4, 515 (1930).

J. Guild, “The Transformation of Trichromatic Mixture Data: Algebraic Method,” Trans. Opt. Soc. 26, 95 (1924);also “The Geometrical Solution of Color Mixture Problems,” Trans. Opt. Soc. 26, 139 (1924).

[CrossRef]

H. E. Ives, “The Transformation of Color Mixture Equations from One System to Another,” J. Frank. Inst. 180, 673 (1915);also “The Transformation of Color Mixture Equations from One System to Another, II. Graphical Aids,” J. Frank. Inst. 195, 23 (1923).

[CrossRef]

F. C. Breckenridge and W. R. Schaub, “Rectangular Uniform-Chromaticity-Scale Coordinates,” Abstract No. 14, J. O. S. A. 27, 226 (1937).

J. Guild, “The Transformation of Trichromatic Mixture Data: Algebraic Method,” Trans. Opt. Soc. 26, 95 (1924);also “The Geometrical Solution of Color Mixture Problems,” Trans. Opt. Soc. 26, 139 (1924).

[CrossRef]

A. C. Hardy, Handbook of Colorimetry (Technology Press, Cambridge, Mass., 1936).

H. E. Ives, “The Transformation of Color Mixture Equations from One System to Another,” J. Frank. Inst. 180, 673 (1915);also “The Transformation of Color Mixture Equations from One System to Another, II. Graphical Aids,” J. Frank. Inst. 195, 23 (1923).

[CrossRef]

D. B. Judd, “Estimation of Chromaticity Differences and Nearest Color Temperature on the Standard 1931 I. C. I. Colorimetric Coordinate System,” J. O. S. A. 26, 421 (1936).

[CrossRef]

D. B. Judd, “A Maxwell Triangle Yielding Uniform Chromaticity Scales,” J. O. S. A. 25, 24 (1935).

[CrossRef]

D. B. Judd, “Reduction of Data on Mixture of Color Stimuli,” Nat. Bur. Stand. J. Research 4, 515 (1930).

D. L. MacAdam, “Theory of Maximum Visual Efficiency of Colored Materials,” J. O. S. A. 25, 249 (1935).

[CrossRef]

F. C. Breckenridge and W. R. Schaub, “Rectangular Uniform-Chromaticity-Scale Coordinates,” Abstract No. 14, J. O. S. A. 27, 226 (1937).

R. H. Sinden, “Further Search for the Ideal Color System, I,” J. O. S. A. 27, 124 (1937).

[CrossRef]

T. Smith, “The Color Triangle and Color Discrimination,” Joint Discussion on Vision, Physical and Optical Societies, London, 1932. The special case of equal luminosity coefficients is discussed, beginning on page 217, with the correct statement that the alychne must be projected to infinity. This projection of the alychne to infinity interferes with the freedom to assign the shape of the spectrum locus. The complete discussion of this case would involve some rather annoying exercises in the evaluation of indeterminate ratios, and will be omitted from the present paper.

F. C. Breckenridge and W. R. Schaub, “Rectangular Uniform-Chromaticity-Scale Coordinates,” Abstract No. 14, J. O. S. A. 27, 226 (1937).

H. E. Ives, “The Transformation of Color Mixture Equations from One System to Another,” J. Frank. Inst. 180, 673 (1915);also “The Transformation of Color Mixture Equations from One System to Another, II. Graphical Aids,” J. Frank. Inst. 195, 23 (1923).

[CrossRef]

R. H. Sinden, “Further Search for the Ideal Color System, I,” J. O. S. A. 27, 124 (1937).

[CrossRef]

D. B. Judd, “A Maxwell Triangle Yielding Uniform Chromaticity Scales,” J. O. S. A. 25, 24 (1935).

[CrossRef]

D. B. Judd, “Estimation of Chromaticity Differences and Nearest Color Temperature on the Standard 1931 I. C. I. Colorimetric Coordinate System,” J. O. S. A. 26, 421 (1936).

[CrossRef]

D. L. MacAdam, “Theory of Maximum Visual Efficiency of Colored Materials,” J. O. S. A. 25, 249 (1935).

[CrossRef]

D. B. Judd, “Reduction of Data on Mixture of Color Stimuli,” Nat. Bur. Stand. J. Research 4, 515 (1930).

J. Guild, “The Transformation of Trichromatic Mixture Data: Algebraic Method,” Trans. Opt. Soc. 26, 95 (1924);also “The Geometrical Solution of Color Mixture Problems,” Trans. Opt. Soc. 26, 139 (1924).

[CrossRef]

Proc. 8th Session, Commission International de l’Eclairage, Cambridge, 1931. Note that the initials, C. I. E., which refer to the French form of the title are sometimes used as an abbreviation instead of the initials, I. C. I.Also, T. Smith and J. Guild, “The C. I. E. Colorimetric Standards and Their Use,” Trans. Opt. Soc. 33, 73 (1931).Also, D. B. Judd, “The Standard I. C. I. Observer and Coordinate System for Colorimetry,” J. O. S. A. 23, 359 (1933).The possibility of future changes in the international system of colorimetric specification cannot be denied. The fact that such changes would render obsolescent the tremendous mass of colorimetric data which is being accumulated by many laboratories in this country and abroad at an accelerating rate now totaling several hundred samples each working day appears to be creating an inertia which will tend to prevent any changes which are not necessitated by the discovery of extremely serious errors in the 1931 recommendations. Evidence of errors of such a serious nature has not as yet been reported by any worker. The particular unitary stimuli in which the I. C. I. specifications are expressed have no peculiar merits, other than convenience for computation, which would lead to their adoption in preference to the ninefold infinity of other conceivable choices of unitary stimuli. They are peculiarly important only in that they are being used widely as bases for colorimetric specifications.

[CrossRef]

A. C. Hardy, Handbook of Colorimetry (Technology Press, Cambridge, Mass., 1936).

T. Smith, “The Color Triangle and Color Discrimination,” Joint Discussion on Vision, Physical and Optical Societies, London, 1932. The special case of equal luminosity coefficients is discussed, beginning on page 217, with the correct statement that the alychne must be projected to infinity. This projection of the alychne to infinity interferes with the freedom to assign the shape of the spectrum locus. The complete discussion of this case would involve some rather annoying exercises in the evaluation of indeterminate ratios, and will be omitted from the present paper.