Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 370
cause exactly analogous to these secondary discharges.We have noticed that it always accompanies a magneticstorm, duringwhich the magnetic elements all over theearth show sudden changes, and earth currents appear in theearth, either as the cause or consequence of these magneticchanges. If we… … Fro. 230. 234. Graham Bells Telephone.—One of the mostwonderful applications of induced currents in modern timesis found in Professor Graham Bells telephone, which firstbrought the telephone into general use. To understand the telephone, we will first show two experi-ments to prove the effect on…
Electricity
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