Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 320
he line resist-ance, consisting, for a short line, of afew turns of moderately stout wire,and, for a long line, of numerousturns of very thin wire. The coilsare placed vertically, and within themhangs a magnetic needle, also havingits axis vertical. This needle (B) isdeflected right or left…
Electricity
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