St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 33
t is held in different positions over a bar magnet. Itsimply takes the directionsof the lines of force asthey pass from the northto the south pole of themagnet. As the earthslines of force pass in cur\-esfrom the north to the southmagnetic pole, j-ou cansee why the magneticneedle dips, unless… … Fig. 34- ABOUT MAGNETS AND MAGNETISM. 31 of the prospedlor, the miners compass, or dippingneedle, proves a serviceable guide to the discover} andlocation of magnetic iron ore. In this instrument themagnetic needle is carefully balanced upon a horizontalaxis within a graduated circle, and in which…
Electricity
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