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 200
IQO 187 Rail-Road Curve. Illustration of sec. 207. The dotted lines are used in sec. 208. This example comprisesmore than half a circle; of course the line P W is shorter tlianP V. In practice no curve ever includes half a semi-circle. … Sliding Rule. The sliding rule has four Hnes—two stationary on the woodenpart, two sliding ones on the brass slip. The upper one on the woodis marked A—the upper one on the brass is marked B—the lowerone on the brass is marked C—the lower one on the wood is mark-ed D, and called girt line.…
Surveying · Civil engineering
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