Higbee, F. G · New York, John Wiley & Sons · leaf 51
Fig. 37. 40 ESSENTIALS OF DESCRIPTIVE GEOMETRY the distance a is from the G. L., and whose base is the dis- Ah tance ao … 34. A line may be revolved into H or V about an axis whichHes in H or V 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…
Geometry, Descriptive
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