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Updated: June 17, 2025
P is a fixed metal pin, carefully insulated from all contact with the engine frame and earth. To this pin one end of the armature winding is connected, whilst the other end is connected to the engine frame.
They've made us the armature in a five hundred million horsepower electric motor." "They can't tear this place loose, can they?" "I don't know it was never " The Chief stopped. Outside a terrific roar and crash had built up. White darts of flame leapt a thousand feet into the air, hurling terrific masses of shattered rock and soil.
In December Welles transmitted this report to Congress with the still sager remark that "The subject of iron armature for ships is one of great general interest, not only to the navy and country, but is engaging the attention of the civilized world." Such was the higher administrative preparation for the ironclad battle of the following year. It was the same in everything.
The only question is how far the equipment was really the ancient warlike custom of the people. It seems in some respects too elaborate to be the armature of a simple and primitive race. At any rate the original character of the Median armies, as set before us in Scripture, and as indicated both by Strabo and Xenophon, is simpler than the Herodotean description.
At the end of this long barrel will be fixed the dynamo, the armature of which is virtually a part of the barrel itself, while the magnets are placed in convenient positions on the supporting uprights.
All sorts of machinery are now worked by the electric motor for instance, cranes, elevators, capstans, rivetters, lathes, pumps, chaff-cutters, and saws. Of domestic appliances, figure 80 shows an air propeller or ventilation fan, where F is a screw-like fan attached to the spindle of the motor M, and revolving with its armature.
Be this as it may, he devised a receiver, consisting of a stretched diaphragm or drum of this material having an armature of magnetised iron attached to its middle, and free to vibrate in front of the pole of an electro-magnet in circuit with the line.
Among the earliest of Edison's dynamo experiments were those relating to the core of the armature. He realized at once that the heat generated in a solid core was a prolific source of loss. He experimented with bundles of iron wires variously insulated, also with sheet-iron rolled cylindrically and covered with iron wire wound concentrically.
Thus, the armature may be divided into two currents, so as to allow of carbons 30 mm. in diameter being burned, or else so as to have four, eight, twelve, twenty-four, or even forty-eight distinct circuits capable of being used altogether or in part.
When the table is pressed lightly upon, the cover bends and the flat circle touches the toothed one, closes the circuit of the pile upon the electro-magnet, which latter attracts its armature and produces a sharp blow. On raising the hand, the cover takes its initial position, breaks the circuit anew, and produces another sharp blow.
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