Encyclopædia Britannica, Ninth Edition/Electric Traction > 자유게시판

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As regards financial system of power, we've within the storage system a extra complex series of transformation of energy, and due to this fact a larger number of items of loss. I believe this financial system can be on the expense of safety, and that the cable of the long run will likely be even heavier, extra perfect, and more costly, than the cable of the present day.-Abstract of Address before the Statistical Society. Notwithstanding, Mr. Newall's partiality for mild cables, he suggests on the close of his evidence what I assume he would consider the most excellent type of cable. The very light cable invented by Mr. Varley (No. 21) admits of being laid by having the pressure taken off the core by the 2 hempen strands, the core itself being the third strand of the cable. Mr. Preece described the Jersey cable as having been destroyed by lightning. He would cowl the copper with India-rubber, protect this core with steel wires vulcanized, the entire then passed through heat; thus insulating all of the wires, he would make the cable in a single length, and have no joints.

I've written sufficient for instance that the present submarine cable shouldn't be a haphazard concept, but one which has grown out of many failures and hundreds of experiments; all the principles of manufacture and laying down have been established by great anxiety and reflection on the a part of the able males who gave their energies to this sort of enterprise prior to 1865. We who have come upon the stage since that date have only found that we could not neglect considered one of all of the recognized principles, but elaborate each one of them, and even then the obligation of laying and sustaining this class of property has sufficient of risks and anxieties to make one heartily dislike any experiment which can only be advocated for the sake of cheapness in the primary cost. There is no such thing as a instance yet of a nicely-manufactured heavy cable breaking or giving out in deep water after it has been rigorously laid free from defects; but there could also be a lot due to the exterior protecting conserving it quiet; there has assuredly been a great deal due to the external protecting within the profitable submerging, and there is no such thing as a experience no matter to justify the assumption that an unprotected core would final, even when laid.

Upward of 30,000 miles of cable have been laid for the reason that report of the committee was printed, eleven years in the past, and far experience has been gained of the exigencies incidental to submerging, buoying, grappling, and repairing; however no truth has resulted from all that experience which has established that any one precaution recommended in the report has been superfluous, whereas a lot has occurred, which I will not particularize, proving that any attempt to disregard any single precaution has resulted in great pecuniary loss or utter failure. As a mild cable, to be manufactured in a great hurry, and laid to satisfy some emergency, it has a superb deal of benefit, however for a deep-sea cable I'm of opinion that it would be discovered too incomplete and unfinished, and that difficulties would be skilled in laying which are not without delay foreseen, what is electric cable and that there can be no durability even if efficiently laid. All cables which have been manufactured and laid upon the rules which had been established in 1859 are yet in good working order, and every divergence from these rules has been at best however a costly experiment or utter failure.

I've said already that the committee called consideration to the remarkable indisputable fact that, in nearly all circumstances, small cables have been discovered liable to mishaps, while the heavier the cable the higher had been its durability. Every day of my experience in watching over the permanence of the 10,000 miles of cable below my care, confirms me within the opinion that too great warning and vigilance can't be exercised in the making and laying a thread which is to be faraway from all human vision without end, and designed to earn dividends by persevering with a perfect conductor of electricity. All of the experience we. I want to write with great respect for the opinions of the proficient men who urge the adoption of gentle cables; it is my particular responsibility to weigh nicely and with out prejudice all they should advance; however I feel a cautious investigation into the experience and follow of the last twenty years establishes conclusively that every one mild cables have been brief-lived, and that every one heavy cables have continued working, often underneath most antagonistic situations. We're every now and then startled by the announcement that mild cables are to be preferred to the present iron-clad sort, and the object of this investigation has been to discover what knowledge there are to justify any desire to one form of cable over one other.