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 (1871)
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 206
of pentagraph has been suggested by Mr. R.Foster, 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 mechanism, and is arranged to turn at pleasure upon the fixed… … internal gearing. The end of each rod has rack-teetli 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, siiuilailygears, with a pinion, f, on the same centre. Thesu two wheelsare, of course, changeable, their relative…
Mechanical drawing
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