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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 630
Fig. 7. Balanced Three-phase Secondary Meter. … Eig. 8. Balanced Three-phase Primary Meter. 618 ELECTRICITY METERS.Electrical engineering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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