Allen, Charles Ricketson, 1862- [from old catalog] · New York, H. Holt and company · leaf 32
holda bar magnet about six inches above it. Bring the magnetslowly down to the compass, watching the needle as you doso. Find in what direction themagnet must be held, and howit must be moved to produce thesame effect on the compass-needle that was produced by (1)connecting the wires, (2)…
Physics
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