Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 161
Figure 137. — Field between Two Unlike Poles. substances are substances whose molecules have N- and S-poles, while non-magnetic substances are those whose mole-cules do not have N- and S-poles. 150 MAGNETISM Iron is the most magnetic substance, while cobalt andnickel are only slightly magnetic.… … Figure 138. — Field between Two Like Poles. The fact that iron is magnetic does not necessarily meanthat a piece of it is a magnet. It must first be magnetized. 181. Difference between a Magnetized Piece of Iron and One Not Magnetized.—In a piece of iron that isnot magnetized the mole-cules have…
Physics
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