Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 282
he Pheight of each station written asin the figure. Suppose that the horizontalplanes are 2 feet apart; if thefirst passes through m and Z>, the second will pass through p, which is 2 feet above m ; andsince n is 3 feet above m, the second plane will cut the linemn in a point s determined by the… … 294 SURVEYING In like manner, the intersections of the planes, respectively,4, 6, and 8 feet above m are traced. The more rapid thechange in level the nearer these lines approach each other. SECTION XXIDRAINAGE SURVEYING Preliminaries. The locality to be drained should first becarefully…
Trigonometry · Surveying · Navigation
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