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 196
racting a species ofgreasiness from the atmosphere and perspiration of the hand,accompanied by an unpleasant odour. The joint of the dividers,and of all compasses, must be made free from all cross play, orlateral looseness. The most ordinary kind are fastened simplyby a common screw. We have,… … metal nut is passed, at the further side. This nut has two smallholes upon its face, for the introduction of the points of a turn-screw, to be met with in most sets of instruments. The joint-leaf of one leg of a pair of compasses is usually of steel, as thisarrangement gives a smoother action than…
Mechanical drawing
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