A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 55
w:^mmmMm/mM:. // ^i^ … the reticule constantly pressed away from the nut, and tlius preventthe introduction of errors due to lost motion in the screw or lackof parallelism in the opposite faces of the threads of the screw ornut. The nut carries a graduated head, H (preferably of zyloniteor some white material), for…
Surveying
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
