A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 31
rlytouch the graduations of the circle. Fasten the circle on a staff,pointed at the other end, and long enough to bring the alidadeto the height of the eyes. The instrument is now complete. Itmay be called a Goniometer, or Angle-measurer. Now let it be required to measure the angle between the… … MAKING THE MEASUREMENTS. 17 other mark at B, a point on one of the lines, and note what degreeit covers—i. e., The Beading. Then, without disturbing thecircle, turn the alidade till it points to 0, apoint on the other line. Note the new read- ing. The difference of these readings (in the / figure,…
Surveying
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