The industries of the world; a complete course of technical education for the manufacturer, operative, and all persons engaged or interested in trade and commerce (1881)
Wylde, James · London, New York, The London Printing and Publishing Company, limited · leaf 367
ffects cause. are evident until a voltaic current passes by the wire round the iron ; but then a great attractive TERRESTRIAL MAGNETISM. force becomes evident. An electro-magnet of soft iron, that we possessed some years ago, was It is evident, from what has been previously made of very pure iron,… … circulation of the voltaic current, no perceptible which we speak. In later times, it has been sign of magnetism could be noticed ; but on send¬ observed that a bar of soft iron is, by the in¬ ing round it a current of fifty Grove’s cells, each fluence of the same power, converted into a platina of…
Industrial arts · Technology
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