Higbee, F. G · New York, John Wiley & Sons · leaf 71
the plane R with MN as one edge andthe other edge one-half as long. By Article 34 revolve MN aboutrR into H. In this position MN will he at MhNh and the planeR will lie at rRrn. With MhNh as one side construct the rec- 59 6o ESSENTIALS OF DESCRIPTIVE GEOMETRY tangle MhNhOhPh making MhPh equal to i… … Fig. so. the diagonal NhPh and let it intersect the trace rR at a. Nowwhen the plane R returns to its first position Nh revolves to nand the diagonal aBn revolves to ab. Since Ph is on thisdiagonal p, the required plan view of P will be found at thepoint where a perpendicular from Ph to rR…
Geometry, Descriptive
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