Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 47
of the vertical pro-jection varies as the angle between ah and V varies. Now o*6*never shows the true length of ab; but there are two positions ofab which do show it, viz., those which correspond to ab at theparticular instant when it is parallel to V. These positions cor-respond to the elements of… … Fig. 23 Turning now to Fig. 23, the operation is repeated in projec-tion. The H and V projections of ah are given and it is re-quired to find the true length of ah and the true angle which it makes with H. A short arc isswung from o* as a center, using a ■radius equal to a^fc*. This arcrepresents a…
Geometry, Descriptive
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