Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 187
deed, the projections av and bv can be located by trans-ferring from the secondary projection the distances of a\v and biv fromG\L\. But if this method be employed, not only the distances, but thedirections of these points from G\L\ must be considered, and there is achance for error. The method of… … Fig. 248. ground line, GL, is taken perpendicular to VQ, and the con-struction is entirely analogous to that of Fig. 247. Two resultsare possible, namely, points a (av, ah) and b (bv, &*). Corollary. To counter-revolve a plane polygon. Analysis. Find the projections of each corner of the…
Geometry, Descriptive
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