Prodromus of a practical treatise on the mathematical arts: containing directions for surveying and engineering (1838)
Eaton, Amos, 1776-1842 · Troy, N.Y., E. Gates; New York, Robinson, Pratt & co., [etc., etc.] · leaf 192
Geometrical trigonometry, is illustrated by plottingthis figure; having the side given, whicli is drawn fromthe angle at 80 to the angle at 70, and drawing the linesup to g, through the marked points on the arcs d and /,until they cross at g. See sec. 34. A / B \ … Frustrum of a cone or pyramid, foundby calculating the pyramid as if toppedout; and then calculating and subtractingthe added point. See sec. 53, article 6. This figure also illustrates the 7th arti.cle, Guaging, under the 53d section.
Surveying · Civil engineering
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