We have many reasons to verify the assumption that a submarine cable, manufactured and laid with strict consideration to all known rules, may be regarded as a considerable property, more likely to last for any size of time; for there is no such thing as a proof no matter upon report which exhibits any decay of the insulating medium or copper conductor of a nicely-manufactured cable, i. I have stated already that the committee referred to as attention to the exceptional undeniable fact that, in nearly all cases, small cables have been found liable to mishaps, while the heavier the cable the greater had been its durability. The loss of cables was discovered to be attributable to the next causes: First, and a very powerful of all, from imperfect manufacture, ensuing without doubt, prior to this date, from inexperience of the supplies for insulating the copper wire, and from ignorance of the fact discovered by Prof. Thomson about 1856, viz., that some sorts of copper wire were no better than iron for the purpose of conductivity, and that it required rigorously-selected copper to offer the specified standard, 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 functions.

Many accidents occurred from inexperience in the tactic of paying out cables; at the present day the surprise is, that they should have succeeded so well with the rude strategies and inexperience which then existed, and never that there should have been many failures and much recrimination. Experience about this time had established that a cable from the graduation of its manufacture to the time of its being laid needs to be tested underneath water and under strain, what is electric cable and saved as much as potential under all the circumstances 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 had been placed at the bottom of the sea, and this one grand omission, largely as a consequence of inexperience, is enough, without the recriminatory points, to condemn to loss and failure any cable whatever.

Eleven years in the past 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, along with other proof." Attention is called in the report to the "outstanding undeniable fact that in virtually all circumstances small cables had been found liable to mishaps, whereas the heavier the cable had been the greater had been its durability." The report is full and complete, and establishes ideas which as much as the current time have uniformly guaranteed success, while the neglect of them has as uniformly resulted in partial loss or failure. There seem to have been mechanical difficulties in preserving the copper conductor in the centre of the insulating medium, so that the copper was generally discovered to be nearly visible underneath the sunshine film of gutta-percha which coated it. That is under no circumstances a brand new subject for investigation, however in the present day I'm certain that it is going to be instructive to many among the thousands who are now interested in this class of property to have their consideration briefly called to all that has been achieved to make submarine cables a sound property.

I consider this financial system would be at the expense of safety, and that the cable of the long run shall be even heavier, more perfect, and more costly, than the cable of the present day.-Abstract of Address before the Statistical Society. One experienced gentleman in his evidence stated these cables have been "similar to no person should have laid in deep water." It is ample at present to know that they have failed from neglect or inexperience, and that they, amongst different failures, have established the rules which have since insured success. These and lots of different examples have established the precept that no cable should be laid with out first obtaining an accurate survey of the strategy to the coast and landing-places, with accurate soundings over the meant route, and as a lot knowledge as doable of the character of the bottom. Every single day of my experience in watching over the permanence of the 10,000 miles of cable below my care, confirms me in the opinion that too great caution and vigilance cannot be exercised in the making and laying a thread which is to be faraway from all human imaginative and prescient forever, and designed to earn dividends by persevering with a perfect conductor of electricity.