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 199
which is referred tosec. 201 to 204, Tan. the tangent fine, from which the line a J is deflexed 10°, anumber equal to half the angle (20°) of the isosceles triangle at thecentre of the circle. The next line c d is deflexed from the chordline a c 20°, a number equal to the angle at the apex of the… … 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.
Surveying · Civil engineering
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