A text-book on chemistry. For the use of schools and colleges (1866)
Draper, Henry, 1837-1882 · New York, Harper & brothers · leaf 192
two isnot constant, the variation of the needle from the truenorth point exhibiting slow increases and diminutions. We have seen that an electric current can developmagnetism in a bar of iron or steel—in the former tran-siently, in the latter permanently. Thus, if the iron bar,n 5, Fig. 154, be… … How does it act toward a magnet? What is Amperes theory ofthe nature of the magnet ? What is the effect of a current runninground a bar of soft iron ? 180 MAGNETO-ELECTRIC CURRENTS. magnet can give rise to an electric current. Thus, inFig. 154, let the terminations, a 5, of the helix, c, bebrought…
Chemistry · Physics
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