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Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)

Johnson, Frank G., 1835- · Chicago, A.H. Andrews · leaf 336

An illustration from Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families, 1878, leaf 336
tor are shownby the figure, in which the radiating lines representthe attractive force. If the magnet be rolled iniron filings, the particles of iron will be attracted to,and held in the position of, these radiating lines. Every magnet has at least two poles, and oneneutral point. The poles are… … 330 MAGNETISM. Sometimes, owing to iuequalitj of temper in the steel, artificial mag-nets have minor poles, situated between the principal ones, calledsecoHdary poles. 606. The la-w of distribution of attraction. — The law regulating the distribution of magnetic force in a bar is, that the forceis…

Physics · Astronomy

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