Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 80
LENGTH OF A LINE 59 Place the line in the position ac (avcv, ahch), parallel to V,making avcv equal to the true length of the line, at the givenangle with H, and sloping upward or downward from a asgiven. Take an axis perpendicular to H through the fixed end, a,and revolve the line until the… … X Fig. 103 (repeated). Fig. 104 (repeated). direction of the H-projection be given, and let the point a bethe fixed end of the line. Through a1 draw ahs, indefinite inlength, and in the given direction. Draw ahar perpendicularto ahs, and make the distance ahar equal to ave. Draw ars in-definite in…
Geometry, Descriptive
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