Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 20
h is found in the United States (Arkansas |and various other parts of the world. In studying the mag-netic attractive force of a piece of lodestone by means of iron filings, it will be found i%$ktifer;> *nat tne attraction for thegjtooj iM.uj^a. jg^ filings seems to be cen- tered at two or… … Fig. 2.- -Magnetised Steel Bar AttractingIron Filings. PRACTICAL ELECTRICITY, Copper Thread Wire a piece of hard iron or steel when they are rubbed togetheiwithout apparently losing any of its original force. Thissteel (a piece of clock spring or a knitting needle willanswer) will now attract…
Electricity · Magnetism
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