Grant, George B. (George Barnard), 1849-1917 · Boston, Grant gear works, incorporated · leaf 77
hich inits simplest condition consists ofa cross, with two grooves at rightangles, and a bar B with two pinsa and h, and a tracing point Pplaced in line. The distance Phbeing set to the major semi-axis, andthe distance Pa to the minor semi-axis, the point P will trace the ellipse if thepins are… … Gardeners ellij^se.
Gearing
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