Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 282
oduced. 917. Induction Shown. A central bobbin, Fig. 335,has a coarse insulated cop-per wire wound upon it.This is called the Prima-ry Coil. Outside of this,a second coil of fine in-sulated wire, several timesthe length of the first,is wound, called the Sec-ondary. The ends of thisFig. 335.… … INDUCTION BY MAGNET. 273 This deflection is in the direction to show a current in theopposite direction to that in the Primary. This inducedcurrent does not continue, for the needle soon returns tozero. II. Break the connection with the battery, and the Gal-vanometer needle is deflected, but in the…
Physics
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