Grant, George B. (George Barnard), 1849-1917 · Boston, Grant gear works, incorporated · leaf 77
Gardeners ellij^se. … Xhe trammel Fig, 124z, trammel should not be tolerated, for thestring and two pins cost less and are morereliable. Elliptic Pitch Lines. 75 139.—APPROXIMATE CIRCULAR ARCS. If a well-made trammel is not at baud, thebest plan is to draw the ellipse with a string,through several constructed points,…
Gearing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
