. Mathematics, compiled from the best authors and intended to be the text-book of the course of private lectures on these sciences in the University at Cambridge [microform]. So in surveying the piece ABCDE, set up marks a, b, c,d, dividing it into as few sides as may be. Then begin atany station a, and measure the lines ab, be, cd, da, and taketheir positions, or the angles a, b, c, d ; and going along thelines, measure all the offsets, as m, n, o, p, &c. along evervstationary line. And this is done either within the field, or without, asmay be most convenient. When there are obstructionswith
. Mathematics, compiled from the best authors and intended to be the text-book of the course of private lectures on these sciences in the University at Cambridge [microform]. So in surveying the piece ABCDE, set up marks a, b, c,d, dividing it into as few sides as may be. Then begin atany station a, and measure the lines ab, be, cd, da, and taketheir positions, or the angles a, b, c, d ; and going along thelines, measure all the offsets, as m, n, o, p, &c. along evervstationary line. And this is done either within the field, or without, asmay be most convenient. When there are obstructionswithin, as wood, water, hills, &c. then measure without, asin the following SURVEYING. 151 PROBLEM X. To survey ajieldby two stations. This is performed by choosing two stations, whence allthe marks and objects can be seen, then measuring the dis-tance between the stations, and at each station taking theangles, formed by each object and the direction of the sta-tionary line or distance. The two stations may be taken either within the bounds, orin one of the sides, or in the direction of two of the objects,or at a distance and without the bounds of the objects, ortract to be surveyed. In this manner, not only grounds may be surveyed with-out even entering them, but a map of the principle parts ofa country, or the chief places of a town, or the survey ofany part of a river, coast, or any inaccessible objects, maybe taken by means of two stations on two towers, two hills,or such like.
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