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Updated: June 25, 2025
These facts appear to have been unknown to Faraday, who, in 1845, by employing powerful electro-magnets rediscovered them, and in addition showed that practically all substances possess the power of being attracted or repelled, when placed between the poles of sufficiently powerful magnets.
When a condenser is put on a dynamo, the condenser current leads relatively to the electromotive force, and therefore strengthens the field magnets and increases the pressure. In order to test this, the following experiment was made for the author by Mr. W.F. Bourne. A Gramme alternator was coupled to the low pressure coil of a transformer, and a hot wire voltmeter put across the primary circuit.
With these hopes I shall, in a short time, offer to sale magnets armed with a particular metallick composition, which concentrates their virtue, and determines their agency.
It would be interesting to know if the sale of magnets exceeds the sale of thermometers, and if so, why? and it would also be interesting to know why magnets are always painted red, as if they were dangerous, or belonged to the Government, or but this is a question into which it is impossible to go now. My present theme is thermometers. It hangs in the kitchen garden.
Below the eight-inch magnets the dust is blown out of the particles mechanically, and they then go to the four-inch magnets for final cleansing and separation.... Obviously, at each step the percentage of felspar and phosphorus is less and less until in the final concentrates the percentage of iron oxide is 91 to 93 per cent.
He was acquainted with Sturgeon's method of making magnets by sending a current of electricity through a wire wound around a bar of iron; and he reasoned, if electricity will make a magnet, a magnet ought to make electricity. As early as 1821 his note book contains this suggestion: "Convert magnetism into electricity."
As we have seen, it was in 1831 that Faraday opened up the field of magneto-electricity. Reversing the experiments of his predecessors, who had found that electric currents may generate magnetism, he showed that magnets have power under certain circumstances to generate electricity; he proved, indeed, the interconvertibility of electricity and magnetism.
The results were so foreign to his experience that he knew there was a trick in it. He soon discovered it. While holding his hand on the frame of the motor he noticed a tremble coincident with the exhaust of an engine across the alleyway, and he then knew that the power came from the engine by a belt under the floor, shifted on and off by a magnet, the other magnets being a blind.
We shall get not so much as a lemon-seed. But I sacrifice myself." We entered the room, and my eyes were drawn, as by the force of a million magnets, to the place where Daisy sat. For the moment she was unattended. She was very beautifully attired, and jewels glistened from her hair and throat. Her eyes were downcast looking upon the waxed floor as if in meditation.
The negative end or pole of this magnet is the wire end of the cord placed in the positive post, and the positive end or pole is the wire end of the cord placed in the negative post. But any magnet may be viewed either as one whole, or be conceived as composed of a succession of shorter magnets placed end to end.
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