The stereoscope and stereoscopic photography (1890)
Drouin, F. (Felix) · Bradford ; London : Percy Lund, The Country Press · leaf 83
tplaced at a short distance,at the same time thatnatural convergence is pro-duced the crystalline lensaccommodates itself instinc-Fig. 57. tively to that distance. The two effects — convergenceand accommodation—being connected, if the eyesconverge as if they were looking at an object atthe*… … AND STEREOSCOPIC PHOTOGRAPHY. 77 a sheet of paper in which two holes, 5 millimetresin diameter, are pierced at about the same distanceas that of the eyes. Hold the sheet in one hand,and the picture in the other ; by degrees place theeyes to the sheet of paper, without ceasing to lookthrough the…
Stereoscope · Photography, Stereoscopic
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