Inhaltsangabe
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1911 Excerpt: ... We recommend that in all quantitative investigations of color vision determinations be made (a) of the wave-length of the stimuli by means of a first-class spectroscope or spectrometer,1 and (b) of the intensity of the stimuli by means of a good spectro-photometer and also, when grating or prism is used, by the use of a radio-micrometer or a selenium cell. V. DESCRIPTION OF STANDARDIZED APPARATUS AND METHOD FOR THE STUDY OF COLOR PERCEPTION The apparatus we have finally decided to recommend as a standard for testing the color perception of animals was described in an early form in the April, 1909, number of the Journal of Comparative Neurology and Psychology, p. 1. In that form there were many objectionable features, such as the use of silvered mirrors, the projection of colored beams upon improperly ground glass surfaces, etc., all of which have been entirely eliminated in the present form.3 In its improved form the apparatus now affords: (1) Means of selecting any two desired bands of homogeneous spectral light of constant and known wave-lengths. Furthermore, (a) the energy of each band is known in C. G. S. units and can be varied at will; (b) the distance between them is adjustable; (c) their right-left position can be interchanged at will. (2) Means of splitting any single chosen beam of monochromatic light into two parts, in such a way that the two beams thus obtained are of the same wave-length, form and size, and are equal in energy. At the same time, (a), (b) and (c) under (1) apply here also. (3) The possibility of substituting for either of the monochromatic bands a beam of white light of the same size and form as the homogeneous chromatic bands. (4) The alteration of the saturation of any monochromatic band by the admixture of white light of know...
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