The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 78
et suspended inan atmosphere of iron vapor. In Fig. 26 the filings represent what are known as MAGNETISM, 6i consequent poles, which may result from imperfections inthe temper of the steel or in the method of magnetiz-ing. Such poles may also be produced in a thin bar ofhighly tempered steel by…
Electricity · Magnetism
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