Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 24
S ^^^^i^iback to N, was introduced by ^■^^^J-.Faraday about 1830, and has been ^^?^fl^1found of great assistance in correla-ting the facts of magnetism. 9. Molecular Nature of Mag=netism. If a small test-tube full ofiron filings be stroked from one end pj jgto the other with a magnet, it willbe… … Direction of Lines of Force about a Horseshoe Magnet. 16 ELECTRICITY AND MAGNETISM 7 magnetism completely. Again, if any magnet is jarred or hammeredor twisted, the strength of its poles as measured by their ability to pickup tacks or iron filings, is found to be greatly diminished. These facts…
Electrical engineering
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