Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 480
from themost toilsome part of his labor, by doingaway with the practice of ascending theladder; and it prevents, as far as possi-ble, the accidents arising from this prac-tice, to which he so often falls a victim.It also enables building operations to be =,carried on with much greater expedition… … FL in height. per min. per hour. in 10 hours. Ft. in height. per min. per hour. in 10 hours. 10 90 5400 54,000 40 22 1350 13,500 20 45 2700 27,000 50 18 1080 10,800 30 30 1800 18,000 60 15 900 9,000 472 ELLIPTOGRAPH. EELIPTOGRAPII. F%. 1841 is a side elevation of the machine, showing the pencil…
Mechanical engineering
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