Gregg, J. B. [from old catalog] · Ada, Ohio, The University herald press · leaf 93
the bar. (4.) Wind some insulated wire spirally around a piece ofiron, and pass the current from a cell through the coil. 82 MAGNETISM. EXPERIMENT 38. LAWS OF MAGNETIC FORCE. Method,— 1. Present the poles of a bar magnet succes-sively to the end of a magnetic needle. Repeat the processat the other… … Mag-nels. of the needle, and aneedle through shortvibrate the needle when he magnet isthree inches from it; and then, when themagnet is four inches from the needle. Data,— (I.) V, , the number of vibra-tions made by the magnet per sec, due to the earths field; (2.) V2l the number of vibrations with…
Physics
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