Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 869
flected downward, thus causing an eddy which removes thegas from the manhole. \ery serious explosions have been causedby the collection of gas in manholes, which becomes ignited eitherby an electric spark or by the torch of a workman. One of the most serious difficulties in connection with… … FIG. 622,-REEL TRUCK. ■wherp a current flowing along the cable sheath leaves the sheathand enters the ground. At this point oxygen is liberated, which,with the chemicals in the earth, rapidly corrodes the lead sheath. Ofcourse, the construction of conduits, composed of insulating mate-rial, will do…
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