Manual of modern surveying instruments and their uses .. (1893)
Lietz, firm, math. instr. makers, San Francisco. (1893. The A. Lietz company) [from old catalog] · [San Francisco] The Company · leaf 102
practically a constantfor any length. It may be determined with sufficient accuracy by adding two meas-urements, taken with an ordinary scale or tape, from the object glass of the tele-scope, when the latter is focused to a distant object: one to the capstan-headedscrews, holding the diaphragm with… … In figure 1, let a =any rod reading, K == a constant expressed by the relationof the distance between the stadia threads and the focal distance of the object glass,then K a — d = distance from the focal point to the rod, for s : f : : a : d , or (1) d = ^J— , wherein J— represents the constant K. s…
Surveying
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
