Small, Sidney Aylmer, 1876- [from old catalog] · Chicago, F. J. Drake & co · leaf 226
olarization prevented. It is very much used for tele-graph circuits, operating the electrical devices in thelock and block signals, the motors in automatic signalsand generally around interlocking plants/ Its pressureis i volt and its current capacity rather low for its re-sistance is 3 or 4 ohms.… … Fig. 111. Gravity Cell Ready for Use. The glass jars should be about 7 inches high and 6inches in diameter. The zinc is cast in a shape so as tobe easily suspended from the edge of the jar. The formshown is called a crow-foot zinc. It weighs about 3pounds. The copper element shown on left of Fig.…
Electricity
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