The stereoscope and stereoscopic photography (1890)
Drouin, F. (Felix) · Bradford ; London : Percy Lund, The Country Press · leaf 123
000000000m oi m t ino t^oo O n6 THE STEREOSCOPE To obtain with certainty the desired relief, wehave used the following process, which is notbased on calculation but on direct observation. The two lenses being properly focussed, weexamined the images on the ground glass by meansof the apparatus… … Fig. 71. two total reflection prisms, movable in a frame,work, which also allows their separation to bevaried so that they may be adapted to differentsights. It is necessary to use an instrument of reflectionbecause the pictures ought to be reversed. Thepictures seen on the ground glass are thus…
Stereoscope · Photography, Stereoscopic
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