The stereoscope and stereoscopic photography (1890)
Drouin, F. (Felix) · Bradford ; London : Percy Lund, The Country Press · leaf 60
2). Between these two positions lie allthe intermediate refractions. This system, alreadyapplied by Rochon to his diasporametve, has beenadapted by Duboscq to his stereoscope withseparate prisms and lenses. For the properworking, the edges of the frames are toothed, andfitted with a toothed wheel.… … Fig- 39.—Duboscqs Stereoscope. button does the regulating. In Duboscqs stereo-scopes the angle a in each prism was 12 degrees.The rotation thus varies the angle from o to 24degrees. Duboscq proposed the use of prismsachromatised by each other, which would suppress,or, at any rate, diminish…
Stereoscope · Photography, Stereoscopic
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