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Updated: May 2, 2025
There, in a corner concealed by an old chest of drawers, stood a battery of five storage-cells connected with an instrument that looked very much like a telephone transmitter, a rheostat, and a small transformer coil. "I suppose this is a direct-current lighting circuit," he remarked, thoughtfully regarding his find. "I think I know what this is, all right.
"In the case of the speaking-arc or 'arcophone, as it might be called," he continued, "the fact that the electric arc is sensitive to such small variations in the current over a wide range of frequency has suggested that a direct-current arc might be used as a telephone receiver.
Hudson Maxim, ordnance and explosive expert, maker of the first smokeless powder adopted by the United States Government. The Inventors' Guild: Peter Cooper Hewitt, inventor of electric lamp, appliances to enable direct-current apparatus to be used with alternating-current circuits, and devices for telephones and aircraft.
The introduction of alternating current for transmission purposes in large cities is probably best exemplified in the station recently erected in Brooklyn, where alternating current is produced and carried to distant points, and then used to operate series arc-light machines run by synchronous motors, the low-tension direct-current network being fed by rotary transformers, and alternating circuits arranged with block converters, and even in some cases separate converters for each individual customer in the scattered districts.
"I've got to have at least a three-thousand-volt direct-current to feed my motors. I will soon have to take up the matter with the Electric Company." The heavy work of setting the electrical parts of the locomotive had been finished the day previous, and the track-derrick was removed.
This is a device which is arranged to convert the alternating current of the coils into a current of one direction in the external circuit, and which in some form is found on all direct-current dynamos. Joseph Saxton, an American, improved upon Pixii's machine by rotating the coils, or armature as it is called, and making the heavier magnet stationary.
Edison's problem in educating the public was rather difficult, for while his low-pressure, direct-current system has always been absolutely without danger to life, there has also been the undeniable fact that escaping electricity might cause a fire just as a leaky water-pipe can flood a house.
By predicting certain properties of electricity which come to the fore when its poles alternate rapidly, he seemed to bring electricity into close kinship with light. This picture, however, satisfactory though it was in the realm of high frequency, failed as a means of describing so-called direct-current processes.
In the early history of the art, electric transmission of power was effected by means of direct-current generators and motors, generators and motors through which the current always passed in the same direction.
I would have it built more compactly if I could." "What is the horsepower?" asked Mr. Damon. "I figure on forty-four hundred horsepower. The power must be received from a three thousand-volt direct-current trolley. There are twelve driving-wheels, as you can see. Each pair of drivers will be driven by a twin-motor geared to the axles through a system of flexible spring drive.
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