Small, Sidney Aylmer, 1876- [from old catalog] · Chicago, F. J. Drake & co · leaf 151
Fig. 68. A Horseshoe Magnet with its Keeper or Armature A. Question 9. How may you determine whether a baris a magnet or not? Answer. To decide the question whether the bar inour hand is a magnet or not we put it to test in this way. 152 ELEMENTARY ELECTRICITY Remember, however, that should the bar… … Fig. 69. Magnetic Needle. 1. Bend a stirrup of copper or brass wire and sus-pend the bar in it. Hang the whole by a single threadthat has been untwisted and soaked in water longenough to take out all the twist. If the bar persistentlyreturns to the north and south line after being movedout of it;…
Electricity
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