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The first paper of this series proposed a re-examination of the Helmholtz colorimetric line element, and described a new mechanico-graphical device that has been employed to assist in selecting the coordinate system for which this expression gives best agreement with modern colorimetric data. The coordinate system thus found is fundamentally different from the one determined by Helmholtz himself, and brings about a greatly improved agreement with experimental measurements. In the present paper the new coordinate system is defined, and numerical results afforded by the Helmholtzian function within this frame of reference are compared with observed data and also with the consequences of another theoretical construction. Conclusions are reached concerning the tenability of the assumptions upon which Helmholtz’ derivation rests.
R. H. Sinden (Thu,) studied this question.