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 (1863)
Armengaud, aîné (Jacques-Eugène), 1810-1891, Armengaud, Charles A., 1813-1893, Amouroux, Jules, Johnson, William, 1823-1864 · Philadelphia : H.C. Baird · leaf 197
will also be observed that the centre point 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, w7hilst the point can easily be replaced if acci-dentally broken. Compasses of the larger size are sometimesmade… … 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 a pen-cil instead of a pen.Tnese compasses re-quire to be adjusted to any desired radius by the direct…
Mechanical drawing
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