Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 243
herefore theplane of the coils, being brought into the magnetic meridianbefore taking an observation. Since a conductor carrying a current exerts force on a magnet 224 Electricity. [Book III. pole near it, the current causes in the air around it a field ofmagnetic force, of which we may estimate… … Fio. 140. at each point is proportional to the current strength, but notthe same for different points in the field. The movement ofthe needle will therefore generally bring its poles into parts ofthe field at which the strength is different. By making theneedle very short compared with the diameter…
Electricity
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