Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 75
istance he or ce from the axis X, equal to thetrue distance ae, of the point from the axis. 54 DESCRIPTIVE GEOMETRY [VIII, § 77 77. The True Length of a Line. Let ab be a straight line ofdefinite length. If placed parallel to any plane of projection,as Q, Fig. 99, the projection of aqbq will… … Fig. 99. suitable axis, a line can always be brought into such a positionthat the true length will appear. 78. First Method for Finding True Length. The projectionof a line is equal to its true length when the line is parallel tothe plane of projection (§ 77). The true length of any straightline…
Geometry, Descriptive
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