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 52
is only necessary to find the H.T. of each of the hnes at R and Srespectively, and the fine passing through these is the H.T. of the plane of thelines. Use this H.T. as a hinge line about which to rabat the plane. Set upthe usual right-angled triangle whose hypotenuse can be used to swing down Bto… … EXERCISK X\II 1. Find the plan of a regular pentagon, i^ edge, whose plane is at 60 to the H.P. and whichhas an edge at 30° to the H.P. 2. Iind the plan and elevation of a regular hexagon, i edge, when it lies in an obliqueplane with \.T. at 60° to XY and H.T. at 45° to XY, and when one edge of the…
Geometry, Descriptive
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