Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 194
173 Assume CrjL, perpendicular to HQ; locate VXQ by means ofsome point, as e, and counter-revolve the square (Prob. 29,Corollary, § 147). As a check, note that the point 2 must fallon the line si, produced, already determined. The long edges of the prism are lines If long and perpen-dicular to Q.… … An alternative method for finding the long edges of theprism is also given in Fig. 254. From point 1 draw the line(lhfh, L/j perpendicular to Qand of unknown length. Findthe true length 1./V Make 1*5!the required length, L§; from5t find the projections 5and 5* (Prob. 30, First Analysis, > 1…
Geometry, Descriptive
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