Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 159
onding H- and F-traces.Only two results are possi-ble, corresponding to thetwo possible slopes : down-ward and forward, anddownward and backward(or upward and backward,upward and forward). Other special cases,which may be solved byinspection, result when(1) either a or ft is 0°, in which case the… … Fig. 216. CHAPTER XV OTHER PROBLEMS INVOLVING THE REVOLUTION OFPLANES 138. The Revolution of a Plane about One of Its Traces. Avery useful revolution of a plane is that in which the plane isrevolved about one of its own traces as an axis. For example,the plane Q may be revolved about HQ as an axis…
Geometry, Descriptive
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