Colour-blindness and Colour-perceptionK. Paul, Trench, Trübner & Company, Limited, 1891 - 311 pages |
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Page 15
... present for comparison ; and others in which no difference can be detected , even with the most careful comparison . These latter will be included in an absolute psycho - phy- sical unit . But the former class will form an approximate ...
... present for comparison ; and others in which no difference can be detected , even with the most careful comparison . These latter will be included in an absolute psycho - phy- sical unit . But the former class will form an approximate ...
Page 31
... present a greater physical contrast to those in the ultra- violet than any two rays in the visible spectrum . If we take the portion of the physical series represented by the spectrum , the two points of greatest physical difference are ...
... present a greater physical contrast to those in the ultra- violet than any two rays in the visible spectrum . If we take the portion of the physical series represented by the spectrum , the two points of greatest physical difference are ...
Page 36
... presents the greatest contrast to the smallest one ; and , in the sound series , it is evident that the deepest bass notes form the greatest contrast to the highest treble , provided that both are heard distinctly . There are several ...
... presents the greatest contrast to the smallest one ; and , in the sound series , it is evident that the deepest bass notes form the greatest contrast to the highest treble , provided that both are heard distinctly . There are several ...
Page 37
... presents quite as great a contrast to No. 1 as No. 20 does . If we cannot distinguish any difference between members . of a series , as far as we are concerned , they may be con- sidered to be exactly alike . It is evident that there is ...
... presents quite as great a contrast to No. 1 as No. 20 does . If we cannot distinguish any difference between members . of a series , as far as we are concerned , they may be con- sidered to be exactly alike . It is evident that there is ...
Page 64
... present comparatively little difficulty . But very few colours in nature are pure ; thus , a piece of blue - green glass , when examined with the spectroscope , is found to be transparent to the violet , blue , and green rays . It is ...
... present comparatively little difficulty . But very few colours in nature are pure ; thus , a piece of blue - green glass , when examined with the spectroscope , is found to be transparent to the violet , blue , and green rays . It is ...
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Common terms and phrases
absolute psycho-physical units after-image ANNA BLACKWELL blue-green bright brown candidate centre colour-blind person colour-perception coloured glass complementary colours contrast correctly crimson dark daylight defect definite colours Demy 8vo distinguish English Essays examination Fcap Fifth Edition four-unit Fourth Edition Frontispiece gaslight gray greenish Holmgren's Illustrations India junction large number LL.B LL.D luminosity Maps match mistakes modified unit neutral band neutral glasses normal-sighted person obtained olive-green orange painted physical series physical units Pilotage pink Plates Pocket Test points of difference Portrait Post 8vo Prof psycho-physical perception psycho-physical series psycho-physical units pure green purple red and green red end red rays retina rose Royal 8vo Sanskrit scotoma Second Edition seen shade simultaneous contrast Small crown 8vo spectroscope spectrum standard red test for colour-blindness theory Third Edition three-unit tion Translated Trinity House two-unit colour-blind violet violet end visual purple vols wools yellow and blue yellow-brown yellow-green Young-Helmholtz theory