Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 868
should be placedunder each cable just at the point where it emerges from the duct,in order to prevent injury of the sheath at that point. Workmenshould be cautioned against needlessly bending cables while workingin ducts, and the use of the cables in place of ladders for climbing inand out of the… … FIG. 621.—ELECTRIC WINCH. the manhole, due to leakage through the earth from gas mains, andcare should always be exercised before striking a match or takinga torch into a manhole, to make sure that all gas has been removed.There are several methods of doing this, one of which is to pumpthe gas out…
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