Inside Out Library · Explore
Scientific American, Vol. 26, No. 2 (1872) (1872)
leaf 4
ifficulty, noted for the strictness of its discipline, has now 456 hands under the most trying circumstances, such as are found in however intrinsically complicated it may be. The ear is at- engines driving mills for crushing ores, and other work in its employ whose services average 20 years, 328… … by its owner, it must have careful and continued ing a partial revolution about the vertical axis attention. of the governor; andthe valve stemand valve are lowered so as to entirely cut off the supply of steam to the en- average 25 years, 51 who average 36 years, and 14 who exceed > © I +E gine,…Internet Archive · Public domain (published before 1931). Free to use for anything.
More pictures from Scientific American, Vol. 26, No. 2 (1872)
More like this
