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 199
o 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, 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 a pen-cil instead of a pen.These compasses re-quire to be adjusted to any desired radius by the direct…
Mechanical drawing
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