Higbee, F. G · New York, John Wiley & Sons · leaf 58
Fig. 42. elevation of the revolved position of N. To find this point re-volve BN parallel to G. L. at bn^. From n, drop a perpendicu-lar to intersect the arc; the point thus found is n, the elevation PROBLEMS ON THE LINE 47
Geometry, Descriptive
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