Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 33
Fig. 19.used in architectural work and occasionally in engineeringwork. On account of the comparative ease with which aidsto visualization may be placed over, rather than under, thedrawing, this quadrant is very generally used in the firstpresentation of a problem in descriptive geometry. Second… … Fig. 20. side of the 77-projection, but on the farther side of the F-pro-jection. The principal use of this quadrant is in the subjectof perspective. Third Quadrant (Fig. 21). The point lies beyond theplane of the drawing in each projection, and must be imagined II, § 20] POINTS AND SIMPLE SOLIDS…
Geometry, Descriptive
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