Color-vision and color blindness, a practical manual for railroad surgeons (1920)
Jennings, John Ellis · Philadelphia F.A. Davis · leaf 96
ss, is nota satisfactory test lor every-day work. It is of serviceas an auxiliary test to be used by the expert. Fig-. 19shows l^rownings pocket spectroscope, which coi]si5>tsof a compound direct-vision prism placed in a slidingtube, at one end of which there is a lens and at theopposite end a… … Fig. 19.—Brownings Spectroscope. (yellow and blue), with a gray or neutral band betweenthem. Violet is usually designated as blue, and thereis a shortening of the left end of the spectrum whenthe intensity of the light is diminished. Berry says: Manv investigators describe the spectrum of the…
Color-blindness · Eye
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