Descriptive geometry for students in engineering science and architecture; a carefully graded course of instruction (1915)
Armstrong, Henry F. (Henry Fry), 1868- · New York, J. Wiley & sons, inc.; [etc., etc.] · leaf 61
It was previously seen that a horizontal line in a plane was parallel to theH.T. of that plane, and now it will be seen that any horizontal line parallel to aplane is parallel to the H.T. of that plane. And, as parallel lines have plans parallelto one another, it will be realized that when two… … Fig. 57. the H.T. of one of the planes is parallel to any horizontal line on the other plane.Hence the solution given in Fig, 57 for finding a plane parallel to ?i given on^^and at a given distance from it. PARALLEL PLANES 53 From any point A in the given plane RST set up a perpendicular AB and…
Geometry, Descriptive
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