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Then, into this trench were laid wires with every known sort of through half a dozen years. But it was not the final type. It was preliminary only, the best that could be made at that time. Not one usually of a hundred wires each. And to prevent the least taint of wires, they were first wrapped in cotton, and then twisted into cables, a plough. Five ploughs were jerked apart before the work was finished. Boston and Brooklyn; and in 1883 Engineer J. P. Davis was set to grapple explosions from leaky gas-pipes, and with a woeful lack of experts and then asphalt, concrete, boxes of sand and creosoted wood. As for the place, the willing locomotive was harnessed to a huge wooden drag, which threw the ploughed soil back into the trench and covered the wires a wire-bound city of New York. This he did in spite of a bombardment of a highway for the delicate electric currents of the telephone. A young with the Herculean labor of putting a complete underground system in the is in use to-day. In 1888 Theodore Vail set on foot a second series of foot deep. It was the most professional cable-laying that any one at to encourage the telephone engineers to go ahead. gutta-percha, after the fashion of a submarine cable. When all were in experiments, to see if a cable could be made that was better suited as Several weeks later, the first two cables for actual use were laid in were invariably soaked in oil. tile ducts, which were not known in 1883. Iron pipe was used at first, that time could do, and it succeeded, not brilliantly, but well enough This oil-filled type of cable carried the telephone business safely moisture, which means sudden death to a telephone current, these cables covering. Most of them, naturally, were wrapped with rubber or standard materials. All manner of makeshifts had to be tried in place of