A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &c. Illustrated by four hundred engravings, and a magnetic chart (1875)
Gillespie, W. M. (William Mitchell), 1816-1868 · New York, D. Appleton · leaf 273
ree or four timbers framed into a Fig- 259. pyramid, as in the figure, with a long mastprojecting above, fulfil the first and lastconditions. The mast may be made verti-cal by directing two theodolites to it and ad-justing it so that their telescopes follow itup and down, their lines of sight being… … Fig. 2C0. Fig. 261. Fig. 2fi2
Surveying
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