12 THE NORTH ATLANTIC TELEGRAPH. mission can be obtained whenever it may be found desirable. The greatest distance from any one station to any other, including slack cable, will not exceed 800 miles. This is of vital import- ance in a commercial point of view, as compared with the two thousand or more miles necessarily laid for the direct communi- cation between the two continents. The transmission of signals between Yalentia and Trinity Bay during the brief existence of the Atlantic cable, is evidence to all the world that signals can be passed through a conductor of more than two thousand miles in length; yet the extreme slowness with which they passed was most discouraging, and would have cast a gloom over the prospects of that undertaking, however successful the results of laying the cable might have been. This retardation is in obedience to the laws of the propagation of electricity; and to work a cable of that length for commercial telegraphy is a problem that requires new discoveries in science to solve. There are certain inevitable effects, from which it is impossible to escape, and the duration of which varies in some proportion to the square of the length of the linear conductor—other things remaining the same. The simple act of dividing the cable into sections, as proposed, will increase its speaking capabilities, as compared with an undivided cable, at least six or eight fold. This is not all. Although it is beyond the power of our electricians to evade these inevitable laws, they will still be able, from the knowledge they now possess, so to construct the core that the effects will be greatly modified; or, to speak plainly, the time necessary for the transmission of consecutive signals will • be still further diminished; and a cable of greater speaking power, length for length, than any heretofore constructed, will be obtained.

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