Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 224
rojection may also represent apoint b, lying on the symmetric parallel S (Sh, Sv). XX, § 168] SURFACES OF REVOLUTION 203 Let C be given. This point lies on the parallel T, whoseF-projection, T, is a straight line through c. The //-projec-tion of this parallel is the circle T*. In Th is found ch by… … FlG. 291. face, unless the assumed projection lies in the contour (outline)of the surface. Thus, if e is assumed in the ^projection, 3f,of the principal meridian (§ 105), the single //-projection, eh,lies in the straight line Mh> which is the //-projection of theprincipal meridian. If /* be…
Geometry, Descriptive
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