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The boys' aërial was a three-wire affair, stretching forty feet, and erected in much the same way as that at the Hooper house, except that one mast had to be put up as high as the gable end of the cottage, which was the other support, thirty-five feet high.
Thus it will be seen that a three-wire system, considered as a whole, is elastic in that it may operate as one when in balance and as two when unbalanced, but in either event giving independent control of each unit.
Brett then tried to lay a three-wire cable from the steamer Dutchman, but owing to the deep water in some places 1500 fathoms its egress was so rapid, that when he came to a few miles from Galita, his destination on the Algerian coast, he had not enough cable to reach the land.
Edison is as much a necessity in their operation as it is in the electric lighting systems, whether those systems be operated on the old two-wire plan, the three-wire plan or by means of alternating currents. Passing from a review of central station plants and distribution system naturally bring us to the operating cost and the factors governing profit and loss of the enterprise.
It was he who erected at Athens the first European Edison station on the now universal three-wire system. Another visitor from Europe, a little later, was Mr. Emil Rathenau, the present director of the great Allgemeine Elektricitaets Gesellschaft of Germany. He secured the rights for the empire, and organized the Berlin Edison system, now one of the largest in the world.
Theoretically, a three-wire installation is evenly balanced by wiring for an equal number of lamps on both sides. If all these lamps were always lighted, burned, and extinguished simultaneously the central conductor would, in fact, remain neutral, as there would be no current passing through it, except from lamp to lamp.
Edison, by his invention of the three-wire system, overcame this difficulty entirely, and at the same time conserved approximately, the saving of copper, as will be apparent from the following illustration of that system, in its simplest form.
There can only be about 10 or 12 miles more, but these weigh 80 or 100 tons. 'July 5. 'Our first mate was much hurt in securing a buoy on the evening of the 2nd. Pain is a terrible thing. Our work is done: the whole of the six-wire cable has been recovered; only a small part of the three-wire, but that wire was bad and, owing to its twisted state, the value small.
The three-wire system is in universal use throughout the world at the present day.
Some of these have already been alluded to; but among the others there is one which is worthy of special mention in connection with the present consideration of a complete system. This is patent No. 274,290, applied for November 27, 1882, and is known as the "Three-wire" patent.
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