Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 165
ving its bearings nicely fitted inthe standards, and thus enabling thetelescope to be moved in either direction,or turned completely around if desired. The different parts of the telescopeare shown in Fig. 87. The object-glass is composed of twolenses, so as to show objects withoutcolor or… … SEC. I.J SURVEYORS TRAI^SIT. 159 The object-glass is carried out or in by a pinion workingin a rack attached to the slide, and thus adjusted to objectseither near or remote as desired. The eye-piece is made up of four plane convex lenses, which,beginning at the eye end, are called respectively the…
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