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
ny point in the H.T. of theplane PQZ, as at aa, and from it set up a perpendicular, marked with arrow-headsin the figure. Now consider this line to be in a vertical plane L.l/.V, and find the 52 DESCRIPTIVE GEOMETRY intersection of LMN with RST, giving a line whose elevation is VH and whichcontains… … 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…
Geometry, Descriptive
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