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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 335

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 335
S and N, as shown.This keeper is found to preserveand increase the attractive force ofthe poles, especially if the whole besuspended by the ring, and weightsbe attached to the hook of thekeeper. 603. Artificial magnets are bars of iron, steel, or tempered steel,to which the property of the… … MAGNETISM. 329 Artificial magnets are more powerful and useful than the lodestoneor natural magnet, and possess properties identical with it. Tem-porary magnets do not retain their magnetism after the exciting causeis removed. Fig. 36.

Physics · Astronomy

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