The standard electrical dictionary; a popular dictionary of words, terms, and phrases, used in the practice of electrical engineering (1897)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · New York, H. W. Henley & co. · leaf 296
lance. An ap-paratus for determining the presence ofa concealed mass of metal. The apparatusis variously connected. The cut shows arepresentative form; a and a are twoprimary coils, each consisting of 100meters (328 feet) of No. 32 silk coveredcopper wire (0.009 inch diameter) wound Fig-197>on a… … Hughes Electro-magnet.
Electricity
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