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
m of pentagraph has been suggested by Mr. R.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 turn at pleasure upon the fixed… … internal gearing. The end of each rod has rack-teeth upon it,the teeth on tho rod, c, gearing wiih a spur-wh-cl, e, fast on astud in the centre of the box; w^iilst the other rod, d, similarlygears with a pinion, f, on the same centre. These two wheelsare, of course, changeable, their relative radii…
Mechanical drawing
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