The practical draughtsman's book of industrial design, and machinist's and engineer's drawing companion: forming a complete course of mechanical, engineering, and architectural drawing. (1857)
Armengaud, aîné (Jacques-Eugène), 1810-1891, Armengaud, Charles A., 1813-1893, Amouroux, Jules, Johnson, William, 1823-1864 · New York : Stringer & Townsend · leaf 202
which it isplaced. In ordinary instruments the legs, o and p, ter-minate in simple points, which are respectively causedto traverse the grooves in the guide-plate, Q, in describ-ing the ellipse. It is, however, found to be almostimpossible to obtain a smooth action with this arrangement, asthe… … . • Fig. 30. an uneven outline. In the instrument represented in figs. 29 and30, the parts which traverse the guide-grooves in the plate, q, con-sist of small steel wheels, o, p, carried in the forked ends of the * See page 17. steel spindles, o, p, which are entered loose into the socket legs,0,…
Mechanical drawing
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