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n.1.A mass, usually of soft iron, but sometimes of some other magnetic metal, as nickel or cobalt, rendered temporarily magnetic by being placed within a coil of wire through which a current of electricity is passing. The metal is generally in the form of a bar, either straight, or bent into the shape of a horseshoe.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in classic literature ?
But this fact that an electro-magnet would set a tuning-fork humming was new to Bell and very attractive.
He brought Bell to his house and showed him what Helmholtz had done--how he had kept tuning-forks in vibration by the power of electro-magnets, and blended the tones of several tuning-forks together to produce the complex quality of the human voice.
The electricity produced passes forward, where it works, by electro-magnets of great size, on a system of levers and cog-wheels that transmit the movement to the axle of the screw.
The technique boosts nerve cells from an electro-magnet coil placed against the scalp.
"I would liken London to an electro-magnet because of Parliament, because of the financial institutions within London," he says.
He does this 'while listening to electronic pulses' and apparently spends 15 minutes a day on an electro-magnet mat, that cost [pounds sterling]2,000 to be installed.
At one of the stores the tobacco had been hidden in a secret compartment behind a shelving unit that could only be opened using an electro-magnet.
The teacher, a skeletal-featured man with the build of a bag of bones, demonstrated an electro-magnet. We were mistaken to believe that such an ambitious project would be entrusted to us 12-year-olds.
Considering the lag of the proportional electro-magnet, pressure sensor, converting time between the signals, it is time-consuming and can't meet the requirement of the system.

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