Higbee, F. G · New York, John Wiley & Sons · leaf 168
theprojection of the element containing it. To find x in this case,pass a plane R through the point perpendicular to H. This planecuts from the warped surface the line OPQ, and obviously x willbe found located on its projection opq. 125. Of warped surfaces having a plane director Fig. 71 is…
Geometry, Descriptive
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