Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 26
e called the datum planes for locating the light. These datum planes, or planes of reference, may be chosenat will. Ordinarily, however, each plane is taken perpendicularto the other two (as in the cases cited above), one being hori-zontal, and the other two vertical. This will be done in this I.… … ff=the horiiontalplane of projection V=the vertical planeof projection P=the profile planeof projection a*=Iiorizontal projection of aa=vertical projection of aFio. 8 a=profile projection of a aa*=horizontal projecting lineaa=vertioal projecting lineaa=profile projecting line on each plane by means…
Geometry, Descriptive
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