St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 30
Fig. 27. ^» \ Fig. 2S. ABOUT MAGNETS AND MAGNETISM. Upon the compass-needle. The space around the magnet,in which this inductive action takes place, is called themagnetic field. Fig. 28 shows some of the positions mm^m
Electricity
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