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Updated: June 20, 2025
When this subject was first mentioned to him, he said he did not know anything of the theory or practice of electro-magnetism, but he would try and find out. The result of his trying was that he won the prize for the most powerful electro-magnet: one is placed in the museum at Peel Park, Manchester, and another with the Scottish Society of Arts, Edinburgh.
Just what part electricity or electro-magnetism plays in the mechanism of the solar radiation it is impossible to say, but on the assumption that it is a very important part is based the hypothesis that there exists a direct solar influence not only upon the magnetism, but upon the weather of the earth.
One night, after I had been out addressing our boys in blue at one of the camps, and had retired for the night, Professor Henry came into my room and, sitting down by my bed, discussed the aspects of the struggle. His mental eye was as sharp in reading the signs of the times as it had been when at Albany, thirty years before, he made his splendid discovery in electro-magnetism.
Though Denmark is a small kingdom containing scarcely three million people, yet it has produced many eminent men of science, art, and literature. The names of Hans Christian Andersen, Rasmus Rask, the philologist, Oersted, the discoverer of electro-magnetism, Forchhammer, the chemist, and Eschricht, the physiologist, occur to us in this connection.
Natural philosopher, s. of a blacksmith, was b. in London, and apprenticed to a book-binder. He became one of the greatest of British discoverers and popularisers of science, his discoveries being chiefly in the department of electro-magnetism. He had an unusual power of making difficult subjects clearly understood.
The idea of transmitting intelligence to a distance by means of electrical action, has been suggested by various persons, from the time of Franklin to the present; but, until the last few years, or since the principal discoveries in electro-magnetism, all attempts to reduce it to practice were, necessarily, unsuccessful.
It was made on the 29th of August, 1831, and should be regarded as inspired by the great discovery made by Oersted in 1820, of the relations existing between the voltaic pile and electro-magnetism.
External excitation, keep in motion, mechanical excitement of respiration, cold effusion to the head and face, feet in hot water, electro-magnetism, internal stimulants, as bicarbonate of ammonia, 5 to 25 grains in water, carbonate of ammonia, 5 to 15 grains in water, coffee and vegetable acids.
Through Professor William Weber he was introduced to the science of electro-magnetism, and they devised an experimental telegraph, chiefly for sending time signals, between the Observatory and the Physical Cabinet of the University. The mirror receiving instrument employed was the heavy prototype of the delicate reflecting galvanometer of Sir William Thomson.
And even less cordial was the reception given the same thinker's theory, put forward in 1863, that the ethereal undulations producing the phenomenon we call light differ in no respect except in their wave-length from the pulsations of electro-magnetism.
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