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 200
eat accuracy and minuteness is calledfor, it will often be found a very tedious matter to obtaic a trueadjustment in this manner, particularly if the joints of the instiu-ment are not in perfect working condition. This difficuily is gotover in what are termed spring, or screw bow cor/if^-^ses BOOK… … very small circles, of half or three quarters of an inch in radius at the most. In the example we have selected for illustration, the tentre leg is of brass, or German silver, and is in one piece with the milled handle. It is also provided with a needle point. The pen is made with a spring-tempered…
Mechanical drawing
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