The stereoscope and stereoscopic photography (1890)
Drouin, F. (Felix) · Bradford ; London : Percy Lund, The Country Press · leaf 59
en thetwo optical systems. In his stereoscope the lensesare only used for magnifying, and the refraction isproduced by prisms placed in front of them. The 52 THE STEREOSCOPE lenses can be moved backwards and forwards forthe necessary focussing, and each prism is inreality divided into two, which… … Fig. 38. on the other, they will, when united, form a platewith parallel faces, and consequently withoutrefraction, if they are placed to fit each other, asin position 1. If the prism P be turned 180 degrees roundthe axis, A A, the two prisms will then have anangle, 2 a, and will produce the…
Stereoscope · Photography, Stereoscopic
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