double touch as described above forstraight bars. In all cases after performing the operation on one side, thebar should be turned over and the process repeated in the same manner. 524. If a soft iron bar be placed within the inductive influenceof a powerful magnet, and while in that position… … «teel bar, is by placing it -u-ithin the coils of an electro-mag-netic spiral, as in Fig. 58. Ifthe helix is direct (see Art. 555),the north pole of the magnet isnext the zinc plate, but with aleft handed helix the north poleis next the copper plate. With aspiral of suflHcient magnitudeany steel…
Physics
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