Higbee, F. G · New York, John Wiley & Sons · leaf 51
by revolving any two of its points. The line and axis must, however, He inthe same plane else onepoint of the revolving linewould touch H or V beforethe other. Fig. 38 shows aline AB revolved into H atApiBh about MN whichhes in H and is parallel toAB. The location of thepoints Ah and Bh maybe found… … REVOLUTION OF POINTS 41 which this may be done may be readily understood by con-sidering that a secondary H or V plane passes through the axis.The revolution, then, may be referred to this new H or V planeand may be accomplished as indicated in Article 32. Fig. 39 shows the plan and elevation of a…
Geometry, Descriptive
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