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Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)

D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 562

An illustration from Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts, 1880, leaf 562 — special machine has beendevised for drilling a bearing from opposite sides simultaneously, so as to avoid the minute inaccu-racy due to the possible bending of a drill hardly three-quarters of an inch in length in passingthrough the wood. One workman inserts the springs, another the pins, and thus… … 540 PICKAXE. gleaned from the fact that the handlings of the parts of a complete upright piano action aggregatesome 27,000. The best felting used for hammer-heads, etc., is made of Silesian wool, and is prepared in sheetsof about 30 x 40 inches in dimensions. Each sheet is made varying in thickness…

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