Mechanical drawing. Elementary and advanced (1910)
Reid, John S. (John Simpson), 1856- · New York, J. Wiley & sons; [etc, etc.] · leaf 124
ind the brilliant point and the point of shade, anddivide the radius I, 2 into a suitable number of equal parts,and draw arcs of circles as shown by Fig. 146, grading themby moving the center a short distance on each side of thecenter of the sphere on the line Bh2 and varying the length ofthe radii…
