The stereoscope and stereoscopic photography (1890)
Drouin, F. (Felix) · Bradford ; London : Percy Lund, The Country Press · leaf 151
nd the lenses mounted on the front i44 THE STEREOSCOPE of the shutter. The shutter has a detachablefront panel, so that the pair of lenses may beremoved and changed for another pair, or a panelcarrying one of the lenses in the centre can besubstituted for taking full sized pictures with thesame… … Fig. 93- proposed to obtain lenses exacflly alike, by cuttingin two an ordinary lens. This idea has never,however, been adopted: in fadt, it is of advantageto keep all the luminous powers of the lenses, andthere is no difficulty in procuring them soaccurately paired that the eye can perceive…
Stereoscope · Photography, Stereoscopic
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