A dictionary of electrical words, terms and phrases (1898)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W. J. Johnston company · leaf 59
ack lead is also termed plumbago or graphite,(See Plumbago. Graphite.) The term black lead is a misnomer, since thesubstance is carbon and not lead. The term is anold one, and is still very generally used. Blasting, Electric The electric ignition of powder or other explosive materialin a blast.… … Fig. 48. Magneto-Blasting Machine. of the handle shown at the top of the figurecauses the rapid rotation of a cylindrical armatureconstructed on the YVheatstone and Siemens prin-ciple. The magnets#.re of iron, and are furnished Ble.J 50 [Boa. with coils of insulated wire. On the rotation ofthe…
Electricity · Electrical engineering
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