. Elementary and dental radiography . tion, the current turned on. for onehour—the electrometer will register one kilowatt-hour. So bills for elec-tricity are made nut for so manv kiKnvatt-hours. Magnetism is a form of kinetic energy veryItladttCtiStn. closely related in its nature to electricity. Mag- netism produces electricit\, and vice versa. 6 ELEMENTARY RADIOGRAPHY The substance in which this energy, or property, magnetism, residesis called a magnet. If a bar of magnetized steel be dropped into iron filings, and thenraised, the fillings will adhere to the ends of the bar, but not to the
. Elementary and dental radiography . tion, the current turned on. for onehour—the electrometer will register one kilowatt-hour. So bills for elec-tricity are made nut for so manv kiKnvatt-hours. Magnetism is a form of kinetic energy veryItladttCtiStn. closely related in its nature to electricity. Mag- netism produces electricit\, and vice versa. 6 ELEMENTARY RADIOGRAPHY The substance in which this energy, or property, magnetism, residesis called a magnet. If a bar of magnetized steel be dropped into iron filings, and thenraised, the fillings will adhere to the ends of the bar, but not to the center (Fig. I-) The ends of the bar represent, respectively, the north, or positive,and the south, or negative, poles of the magnet. If, now, this bar bebroken at its exact center, instead of having a half magnet all northpole and another half magnet all south pole, we have two magnets withtwo poles each. If one of these magnets be broken at its center the samething occurs, namely, two magnets, each one-half as large as the first,.
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