Grant, George B. (George Barnard), 1849-1917 · Boston, Grant gear works, incorporated · leaf 78
ough several constructed points, and thento ink it by finding centers for approximatearcs, as shown by Fig. 125. An arc from acenter m on the major axis, will coincidevery well with the curve near the majorapex, a similar arc n from a center on theminor axis will serve near the minor apex,and a… … The elliptic involute 140.—FOUR CENTER ELLIPSE. When the ratio of the axes is not less thaneight to ten, as is generally the case, a prac-tically perfect ellipse may be drawn fromfour centers by the following method. Draw the line CL, Fig. 126, parallel toAB, and construct the point u on the…
Gearing
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