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Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 36
Fig. 12. — Thomson Reflecting AstaticGalvanometer with Four Coils GALVANOMETERS. 23Electrical engineering
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