A dictionary of electrical words, terms and phrases (1896)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W.J. Johnston company · leaf 61
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. of the handle shown at the top of the figurecauses the rapid rotation of a cylindrical armatureconstructed on the Wheatstone and Siemens prin-ciple. The magnets are of iron, and are furnished Ble.] 50 [Boa. with coils of insulated wire. On the rotation ofthe armature the current developed…
Electricity · Electrical engineering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten15unit-381-225.webp)
