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We've many reasons to verify the belief that a submarine cable, manufactured and laid with strict attention to all known ideas, may be considered a substantial property, likely to final for any length of time; for there isn't any evidence whatever upon document which reveals any decay of the insulating medium or copper conductor of a nicely-manufactured cable, i. I've mentioned already that the committee known as consideration to the outstanding proven fact that, in virtually all instances, small cables have been discovered liable to mishaps, while the heavier the cable the better had been its durability. The loss of cables was found to be attributable to the following causes: First, and the most important of all, from imperfect manufacture, resulting no doubt, previous to this date, from inexperience of the supplies for insulating the copper wire, and from ignorance of the actual fact discovered by Prof. Thomson about 1856, viz., that some sorts of copper wire have been no better than iron for the purpose of conductivity, and that it required rigorously-chosen copper to give the specified normal, which could also be represented by a copper wire one-tenth of an inch in diameter, being equal to an iron wire one-third of an inch in diameter for electrical purposes.

Many accidents happened from inexperience in the method of paying out cables; at the present day the marvel is, that they need to have succeeded so effectively with the rude methods and inexperience which then existed, and not that there ought to have been many failures and much recrimination. Experience about this time had established that a cable from the commencement of its manufacture to the time of its being laid should be tested underneath water and underneath strain, what is electric cable and stored as much as possible under all the conditions in which it was meant to continue. The Red Sea and Indian cables are said to have been imperfectly manufactured and laid too taut, however they weren't tested underneath water from the time of manufacture until they have been placed at the bottom of the sea, and this one grand omission, largely because of inexperience, is sufficient, without the recriminatory points, to condemn to loss and failure any cable no matter.

Eleven years ago there was a joint committee appointed by the "Lords of the Committee of Privy Council for Trade and Atlantic Telegraphy, to inquire into the development of submarine cables, together with other evidence." Attention known as within the report to the "remarkable indisputable fact that in nearly all cases small cables had been found liable to mishaps, whereas the heavier the cable had been the better had been its sturdiness." The report is full and complete, and establishes principles which as much as the present time have uniformly assured success, while the neglect of them has as uniformly resulted in partial loss or failure. There appear to have been mechanical difficulties in holding the copper conductor in the centre of the insulating medium, so that the copper was typically found to be nearly visible beneath the sunshine movie of gutta-percha which coated it. This is on no account a new topic for investigation, however in the current day I am sure that will probably be instructive to many among the hundreds who are actually interested in this class of property to have their attention briefly known as to all that has been completed to make submarine cables a sound property.

I consider this economic system can be at 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 current day.-Abstract of Address earlier than the Statistical Society. One skilled gentleman in his evidence mentioned these cables were "similar to no person ought to have laid in deep water." It is sufficient at present to know that they've failed from neglect or inexperience, and that they, among different failures, have established the principles which have since insured success. These and plenty of different examples have established the precept that no cable needs to be laid with out first obtaining an correct survey of the approach to the coast and landing-places, with correct soundings over the supposed route, and as a lot data as possible of the character of the bottom. Every day of my expertise in watching over the permanence of the 10,000 miles of cable beneath my care, confirms me within the opinion that too nice caution and vigilance can't be exercised in the making and laying a thread which is to be removed from all human vision eternally, and designed to earn dividends by persevering with an ideal conductor of electricity.