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 (1854)
Armengaud, aîné (Jacques-Eugène), 1810-1891, Armengaud, Charles A., 1813-1893, Amouroux, Jules, Cory, William Johnson, 1823-1892 · New York, Stringer & Townsend · leaf 314
his 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 OP 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 fordif-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 of…
Decorative arts · Drawing
Internet Archive · Clark Art Institute Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Cours d'architecture enseigné dans l'Academie royale d'architecture : premiere[-cinquième] partie ... (1675)](https://img.insideoutlibrary.com/img/200/ia-coursdarchitectu00blon-232-101.webp)
