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 72
em is at 30° to the H.P.and the other is at 45° to the H.P., and the angle contained by them is 80°. By placing both lines in the V.P. as in Fig, 65-, (i), at A and B, starting themboth from the same point and producing them downward to their H.T.s at a and brespectively, their plans, proper for… … Fic. 65. to 80°. This 80° will be subtended by a line, across the H.P. between the H.T.sof the lines, the length of which must be found, therefore with c as centre moveB toward A until 80° is enclosed as shown by the arrow-headed arc. This givesthe distance abo required to subtend 80° when the…
Geometry, Descriptive
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