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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

An illustration from 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, leaf 272
findDC, one calculation checking the other. DC then becomes a baseto calculate EF; which is then used to find GH ; and so on. The fewer primary stations used, the better; both to preventconfusion and because the smaller number of triangles makes thecorrectness of the results more probable. The… … 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…

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