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 199
so be observed that the centre pomt is a needle,held by a small screw, in a socket formed in the leg of theinstrument. This arrangement affords a means of adjustmentas to length, whilst the point can easily be replaced if acci-dentally broken. Compasses of the larger size are sometimesmade with… … Fig. 14. size and strength, isless liable to injury.Both legs of the bow-pen compasses arejointed. Fig. 19 is afront elevation of aninstrument preciselysimilar to the last, ex-cept that it has tcil instead of a pen.These compasses re-quire to be adjusted to any desired radius by the direct action…
Mechanical drawing
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