Color-vision and color blindness, a practical manual for railroad surgeons (1920)
Jennings, John Ellis · Philadelphia F.A. Davis · leaf 83
from skeins 21 to -10. If normalor 2reen-blind he will select blues onlv, but if red-blind fO COLOR-VISION AND COLOR-BLINDNESS. he will pick out a series of roses, which should be recorded.*^ Olivers worsted test. The test, as described by tlie author, is as follows: A square of black muslin is… … o^ v^ r^ f^ fio* Fig. 16.—Olivers Wop-sted Test. pure matcli skeins, each being a pure tint of definite inten-sity of one of the colors of the large skeins, and eighteensmall confusion skeins of the same intensity, each con-taining a mixture of certain definite percentages of twoor more of tlie…
Color-blindness · Eye
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