Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 431
needle, which is de-flected by the current, or this bar which is sucked into the coil, it isevident to every person of sense here that work is being done. Thatis to say, that when the needle is moved away from the position whichit naturally occupies, work is being done. Where does this workcome… … Fig. 4.—Electro-magnet supporting a bridge of nails. work, and in order to do work it must take away a part of the currentfrom that current which is acting. Now, in order to take away fromthe current it must have started a feeble opposing current in an op-posite direction. And here is the point…
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