Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 474
relieves the workman 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 becarried on with much… … Ft in height, per mul.10 90 20 45 30 SO per hour.540027001800 in 10 hours.54,00027,00018,000 Ft. in height, per rain.40 22 50 18 00 15 per hour.13501080900 I carried up a m 10 hours,13,50010,8009,000 ELLIPTOGRAPH. ELLIPTOGRAPH. Fig. 1341 is a side elevatinn of the machine, showing the pencil…
Mechanical engineering · Mechanics · Engineering
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