St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 27
mar-iners and others. Fig. 25 shows an ordinarj^ pocketcompass, and Fig. 26 a form of mariners compass, inwhich the small bar magnets are fastened to a cardwhich floats, the whole being so mounted that it keeps ahorizontal position, even though the vessel rocks. … Fig. 26. 32. Action of Magnets Upon Each Other. By making two small sewing-needle magnets, j-ou can easilj^study the laws of attracftion and repulsion. By bringingthe two north poles, or the two south poles, near eachother, a repulsion will be noticed. Unlike poles attradleach other. The…
Electricity
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