Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 309
l plane will cut the line from A to B. This distance beingthus found, and laid off from A to o, gives o, a point of thecurve in which the seventh plane intersects the ground. Thepoints at which it cuts the line from A to C, and the line from 302 ELEMENTS OF SURYEYIXG. [book VIII. A to D, are… … Fig. 154. It consists of two arms, or sides, which open by turninground a joint at their common extremity. On each arm of the sector, there is a diagonal line thatpasses through the point about which the arms turn: thesediagonal lines are diyided into equal parts. The advantage of the sectoral…
Surveying
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