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Updated: May 25, 2025
It was of circular form, incased in iron, with the ends of several small magnets sticking through the floor. A pulley and belt, connected to a circular saw larger than the motor, permitted large logs of oak timber to be sawed with ease with the use of two small cells of battery.
Some four years after Arago's discovery, Sturgeon made the first "electro-magnet" by winding a soft iron core with wire through which a current of electricity was passed. This study of electro-magnets was taken up by Professor Joseph Henry, of Albany, New York, who succeeded in making magnets of enormous lifting power by winding the iron core with several coils of wire.
Hopes were entertained that electric lights might be introduced, but the great difficulty is to maintain an equable force, as the battery gradually declines in power. There are also other difficulties to be mastered. The most successful experiments have been carried on in the South Foreland lighthouse, by an arrangement of powerful magnets.
This latter Albinia would not believe, especially as she saw that little Maurice's blue eyes were magnets that held the silent Sophy fast, but surly denials silenced her interrogations as to illness, and made her content to acquiesce in Lucy's explanation that Sophy was only cross because the Osborns and Drurys were not asked.
It may be, that, in the hearing, some scattered reminiscences will be as it were awakened, to stir again in the dark lethargy of thy sleeping soul. And then she began to speak. And as she spoke, she leaned forward, as she sat upon the fallen pillar, and fastened her great eager eyes like magnets on his own. And as Aja watched them, they played as it were upon his heart.
But they can be educated, and every man of refined sensibilities can, by learning to recognize his true affinity, so educate his sexual instincts that they will be as true as the needle to the pole, and he will learn to so distinguish the conditions of magnetic attraction and repulsion that he will be attracted by that which is favorable to his own constitution, and repelled by that which is unfavorable, as sensitively as these magnets.
Röntgen's rays have rearranged some of the older ideas of matter, while radium has revolutionised them, and is leading science beyond the borderland of ether into the astral world. The boundaries between animate and inanimate matter are broken down. Magnets are found to be possessed of almost uncanny powers, transferring certain forms of disease in a way not yet satisfactorily explained.
The first phonograph; improving the telegraph so that six messages can be sent over the same wire at the same time; improving the telephone so that everybody can use it; collecting fine iron ore from sand and dirt by magnets; increasing the power and the lightness of the storage battery. And there are the trolleys and electric railways that have been made possible.
It consists of a very long fine coil of silk-covered copper wire, and in the heart of the coil, within a little air-chamber, a small round mirror, having four tiny magnets cemented to its back, is hung, by a single fibre of floss silk no thicker than a spider's line. The mirror is of film glass silvered, the magnets of hair-spring, and both together sometimes weigh only one-tenth of a grain.
Muirhead and Hopkinson have also designed a magneto-electric alternating current machine; but as it closely resembles the machines described, with the exception that permanent magnets are employed as field magnets, we need not dwell upon it further. Engineering. By GEORGE LEUCHS.
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