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 198
e great accuracy and minuteness is calledfor, it will often be found a very tedious matter to obtain a trueadjustment in this manner, particularly if the joints of the instru-ment are not in perfect working condition. This difficulty is gotover in what are termed spring, or screw bow compasses.…
Mechanical drawing
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