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
her form of pentagraph has been suggested by Sir. E.Forster, jun., of Dublin, which seems susceptible of being rendereda very efficient instrument. It is delineated in fig. 41. Thesmall and shallow circular box, A, contains the actuating mecha-nism, and is arranged to tum at pleasure upon the fixed… … internal gearing. The end of each rod has rack-teeth upon it,the teeth on the rod, c, gearing with a spur-wheel, e, fast on astud in the centre of the box; whilst the other rod, d, similarlygears with a pinion, f, on the same centre. These two wheelsare, of course, changeable, their relative radii…
Decorative arts · Drawing
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![An illustration from The Telegrapher [microform] (1864)](https://img.insideoutlibrary.com/img/200/ia-telegrapher04nati-260-112.webp)
