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 272
igure on the opposite page represents part of thescheme of the primary triangulation resting on the Massa-chusetts base and including some remarkably well-conditionedtriangles, as well as the system of quadrilaterals which is a valuablefeature of the scheme when the sides of the triangles are… … 266 TRIANGULAR SURVEYING. [part y (384) Signals. They must be high, conspicuous, and so madethat the instrument can be placed precisely under them. Three or four timbers framed into a Fig- 259. pyramid, as in the figure, with a long mastprojecting above, fulfil the first and lastconditions. The…
Surveying
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
