A handbook on the teeth of gears, their curves, properties, and practical construction (1887)
Grant, George B. (George Barnard), 1849-1917 · [Boston] · leaf 78
known. But I am not aware that thereis a known single instrument that will draw all of the curves by changesin its setting and not in its construction. The instrument here described may be called the conic compass because itwill draw either of the conic sections, and in its arrangement and method… … THE COIVIC COMPASS. A pencil rod S is so held that as it revolves it always represents an elementof a cone with vertex at 0, and its two pencils P and Q will always be in thesurface of the cone. The paper represents the intersecting plane, and theline traced by the pencil on the paper must be the…
Gearing
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