Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 79
ssarily involves a consider-able loss of light, with a fur-ther liability to the impairmentof the image by the smallestwant of exactness in the formof either of the prisms.Second, the mechanical ar-rangements requisite for vary-ing the distance of the bodies,involve an additional liabilityto… … Nachets Stereoscopic Binocular. examination of objects unsuited to the powers of his Binocular.Fourth, the parallelism of the bodies involves parallelism of theaxes of the observers eyes, the maintenance of which for anylength of time is fatiguing. 34. Wenhams Stereoscopic Binocular.—All these…
Microscopy · Biology
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