Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 57
sm ofsteel depends. The same effect will be produced by heatingthe magnet—a red heat not only destroying all traces of mag-netism, but making the metal quite indifferent to magnetism. CHAPTER IV.TERRESTRIAL MAGNETISM. 27. Field of Terrestrial Magnetic Force.—That the earth, as a whole, is magnetic… … Fig. 33. points in the earths field of force. We must, therefore, findfor every place on the earth, where possible, the direction ofthe line of magnetic force, and the strength of the magneticfield. To find the direction of the line of force at a givenpoint, we have only to suspend a bar of steel…
Electricity
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