Mechanical drawing. Elementary and advanced (1910)
Reid, John S. (John Simpson), 1856- · New York, J. Wiley & sons; [etc, etc.] · leaf 123
the hor. projection of thebisecting line. A plane drawn per. to this bisecting line andtangent to the sphere touches the surface at the pointsB°B* where the bisecting lines pierce it. Therefore RB11 arethe two projections of the brilliant point. io8 MECHANICAL DRAWING The point of shade can be…
