The essentials of descriptive geometry . 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 H and is parallel toAB. The location of thepoints Ah and Bh maybe found as indicated inArticle 32. 35. Either a point or aUne may be revol

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The essentials of descriptive geometry . 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 H and is parallel toAB. The location of thepoints Ah and Bh maybe found as indicated inArticle 32. 35. Either a point or aUne may be revolved aboutan axis into the plane of the axis when the plane does not coin-cide with the H or V but is parallel to H or V. The method by

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