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 206
. In this case, however,the radii of the arcs would be uniform, and an arrangement isrequired, providing for the increase or decrease in length of thetwo radii, but in such a manner that they shall continually BOOK OF INDUSTRIAL DESIGN. 195 be in the same proportion to each other. This is effected… … to each other, and itIS likewise desirablethat the instrumentshould be capable of adjustment for dif-ferent proportions, otherwise its scopeof usefulness would be sadly narrowed. These several conditions are fulfilled in the instrument repre-sented in our engraving, fig. 40, which is a pentagraph…
Mechanical drawing
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