Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 258
steel, and nicely ground, so as to turn evenly andfirmly in a hollow cylinder of bell-metal; this again has itsexterior surface fitted and ground to the main socket EE of thetripod-head. The bronze cylinder is held upon the spindle by a washer andscrew, the head of the last having a hole in its… … &A screwed from the legs, so that both may be convenientlypacked in the box. A little under the upper parallel plate of the tripod-head, andin the main socket, is a screw which can be moved into a corres 252 ELEMENTS OF SURyEYi:5sG. [BOOK Til. ponding groove, turned on the outside of the hollow…
Surveying
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
