Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 45
rojections O1 and Ovare both perpendicu-lar to the ground line, and at the same point. Let a/ be anypoint on Ch. The projector from ah coincides with O, and theparticular point, a, on C, which corresponds with ah cannotbe determined. The line C is therefore indeterminate. Buiif the line be… … 35. The Profile Line. A plane which is perpendicular tothe ground line is known as a profile plane, and any line lyingin a profile plane is termed a profile line. We have just seenthat such a line cannot be projected in the same way as thegeneral straight line. Hence problems in which such…
Geometry, Descriptive
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