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 (1871)
Armengaud, Charles A., 1813-1893, Armengaud, Charles, 1813-1893, [from old catalog] joint author, Amouroux, Jules, [from old catalog] joint author, Johnson, William, 1823-1864. [from old catalog] · Philadelphia, H. C. Baird · leaf 202
hich 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, asllio… … Fiff. 30. ati uii(\cn (nilliiic. In the instrument rrprcsrnlcil in fishs. 29 and30, the parts which traverse the guide-grooves in Iho plate, q, con-sist of small steel wheels, o, p, carried in the forked ends of the * Sec pngc 17. steel spindles, o, p, vi^hich are entered loose into the socket…
Mechanical drawing
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