. The Journal of comparative neurology and psychology. The .Tournal of Comparatitb NBUROLOfiv AND Psychology.—Vol. XIX, No. 1. Watson, Color Vision in Fig. 5. 10 Journal of Co^nparative Neurology and Psychology. faint band of red and of green light on the screen. In order tointensify and sharply define the hands on the screen, two smallachromatic lenses, L^ and Lr„ are interposed in the pathways ofthe two beams, B and G respectively. These two lenses are of shortfocal length (6). They project sharply defined and enlargedimages of the two openings of So npon the screen (marked redand
. The Journal of comparative neurology and psychology. The .Tournal of Comparatitb NBUROLOfiv AND Psychology.—Vol. XIX, No. 1. Watson, Color Vision in Fig. 5. 10 Journal of Co^nparative Neurology and Psychology. faint band of red and of green light on the screen. In order tointensify and sharply define the hands on the screen, two smallachromatic lenses, L^ and Lr„ are interposed in the pathways ofthe two beams, B and G respectively. These two lenses are of shortfocal length (6). They project sharply defined and enlargedimages of the two openings of So npon the screen (marked redand GKEEN in the diagram). These images are abont 7 in heightand 1% in width. Four reversing mirrors, BM, are used in order to reverse theright and left positions of the two beams. These mirrors revolvein a vertical plane. They are mounted in bearings in such a way?that the small weights, Wgt, pull them back to the 45° positionwhenever the cords, CBM, are slackened, as in the diagram. Thesecords are jointly fastened to a rod at X. A single forward pullupon this rod brings all four mirrors to the 180° position, in whichposition they no longer intercep
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