A treatise on levelling, topography, and higher surveying (1876)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, b. 1840, ed · New York, D. Appleton and company · leaf 35
apering pins, so thatthe telescope can be clamped in any position.The milled-headed screws at M and M areused to move the object-glass and eye-piece inand out, so as to adjust them for long andshort sights, and for short-sighted and long-sighted persons. L is a spirit-level; P and Pare parallel… … BCwr~w C J (28.) The Telescope. The arrangement ofthe parts of the telescope is shown in Fig. 20.O is the object-glass, by which an image ofany object, toward which the telescope maybe directed, is formed within the tube. E E isthe eye-piece—a combination of lenses, so ar-ranged as to magnify the…
Surveying
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
