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 (1866)
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 200
s, however, found to be almostimpossible to obtain a smooth action with this arrangement, asthe pressure on the points, being oblique to their line of move-ment along the guide-grooves, the friction is apt to be u-regular,and so cause a varying motion of the pen or pencil point, and produce Fig.… … Fig. 30. Jin nnfvon outline. In the instrument represented in figs. 29 and30, Iju! parts which traverse the guide-grooves in the plate, (), con-sist of small steel wheels, o,;;, can-icd in the forked ends of the * See page 17.
Mechanical drawing
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