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外文期刊>Telegraph-Engineers and Electricians, Journal of the Society of
>Discussion on ÃÂÿOn some instruments for the measurement of electro-motive force and electrical powerÃÂÿ, by Dr. J.A. Fleming and C.H. Gimingham, Esq., and ÃÂÿPortable voltmeters for measuring alternating potential differencesÃÂÿ, by Professors W.E. Ayrton and John Perry
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Discussion on ÃÂÿOn some instruments for the measurement of electro-motive force and electrical powerÃÂÿ, by Dr. J.A. Fleming and C.H. Gimingham, Esq., and ÃÂÿPortable voltmeters for measuring alternating potential differencesÃÂÿ, by Professors W.E. Ayrton and John Perry