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Updated: June 17, 2025
Bless the pair of them, they might have been a month there, and no better off for, you must know that I had taken out the armature, and if you take out an armature and don't slip a bit of soft iron in after it, your magnets are done for, and will never be worth anything again until they are re-magnetised.
The former is connected to a system of levers by which a reciprocating motion is imparted to it by means of a suitably arranged cam on the side shaft. It has been found that better results are obtained by causing the magnetic field to move relative to the armature winding than to move the latter through a stationary field. Reference to the diagrams, figs. 20 and 21, will make this clear.
The place of the small pulley was taken by an 8-toothed pinion wheel, engaging with a pinion soldered to the near driving wheel, the diameter of which it exceeded by about 3/16 inch. The pair, originally parts of an old clock purchased for a few pence, gave a gearing-down of about 9 times. The position of the driven wheels relatively to the armature must be found experimentally.
In passing through the instrument the current proceeds from one terminal, say that on the right, by the wire W to the screw contact T, and thence by the spring S through the bobbins of the electromagnet to the other terminal. The electromagnet attracts the armature A, and the hammer H strikes the gong; but in the act the spring S is drawn from the contact T, and the circuit is broken.
In the midst of his tirade he was summoned to the office, where he was closeted for more than an hour with Mr. Bangs and Mr. Shields. When he emerged, it was with the avowed belief that the armature had been defective when received. This sudden change of front, taken in connection with the fact that the third payment was due on the motor in less than sixty days, set every tongue wagging.
The speed of the car is regulated by the amount of current which the motorman allows to pass through the motor and the circuits through which it flows in order to produce different effects in the magnetic attraction of the magnet and the armature.
It consists of a single armature core with a motor winding and a generator winding on it and each of these has its own commutator. Where the low voltage current flows into one of the windings it drives its as a motor and this in turn generates the higher voltage current in the other winding. Get a 100 watt 350 volt motor-generator; it is shown at F and costs about $75.00. The Panel Cut-Out.
The current of the series machine varies with the resistance of the external or working circuit, because that is included in the circuit of the field magnets and the armature. Thus, if we vary the number of electric lamps fed by the machine, we shall vary the current it is capable of yielding.
Then almost mechanically he went towards the switch in the shadow and turned the current into the railway circuit again. As he did so the singed body loosened its grip upon the machine and fell forward on its face. The core of the dynamo roared out loud and clear, and the armature beat the air. So ended prematurely the Worship of the Dynamo Deity, perhaps the most short-lived of all religions.
The pencil fastened to the armature which had marked zigzag lines on the moving paper was replaced by a fountain-pen which inscribed long and short lines, and thus the dashes and dots of the Morse code were put into their present form.
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