Anthony, Gardner Chace, 1856- [from old catalog], Ashley, George Francis, [from old catalog] joint author · Boston, D. C. Heath & co. · leaf 38
A and B.32. Case 3. Method. If one of the given lines is parallel to the ground line, the requiredplane will be parallel to the ground line, and,therefore (Figs. 37 and 38, page 13), thetraces of the plane Avill be parallel to theground line. This problem may be solved byCase 2, or by the following… … Fig. 59
Geometry, Descriptive
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