. The Canadian journal ; a repertory of industry, science, and art ; and a record of the proceedings of the Canadian Institute. 34 IRISH SUBMAEINE TELEGRAPH. [1852, more propriety as the shield of the fragile highway on which that messenirer travels. Even scientific men do not always perceive the more obvious facts connected with the matter on which they operate; and, in the first instance, subaqueous telegTaphs were proposed of wire, coated with gutta pereha alone. That material possesses great powew of resistance; but yet, placed beneath the ocean, sunk a hundred fathoms, or any other number
. The Canadian journal ; a repertory of industry, science, and art ; and a record of the proceedings of the Canadian Institute. 34 IRISH SUBMAEINE TELEGRAPH. [1852, more propriety as the shield of the fragile highway on which that messenirer travels. Even scientific men do not always perceive the more obvious facts connected with the matter on which they operate; and, in the first instance, subaqueous telegTaphs were proposed of wire, coated with gutta pereha alone. That material possesses great powew of resistance; but yet, placed beneath the ocean, sunk a hundred fathoms, or any other number of fathoms deep, and chafed against rocks, even the wrecte of vessels, or many other substances, it would fail. The wire coated with gutta pereha was even, we believe, thrown over the British channel, but it did not maintain the communication for more than twenty-foiu' houi-s. It was now clear that the gutta pereha would protect the wires of the subaqueous telegraph, if it could be itself secured against the rough handlingwhich all invadingsubstances experience at times from the ocean. The latter object has been effected by galvanized wires twisted in a spiral form round the gutta pereha case, in which a copper wire is enclosed. The telegraph across the channel to the French coast was put down in the month of September last. It has now been in operation from ten to eleven months, and the insulation of the wiro is so complete that the communication has been steadily maintained. In June last, a teleo-raph line was thrown over the Irish channel from Holyhead to Howth. The distance between these points is full sixty miles, and the coast on both sides " rocky and ; The agitation in favour of an Irish Atlantic steam-packet port caused considerable excitement on telegraphic matters. Wires could easily be suspended from Dublin to Gal way along the line of railway; and the difficulties of the channel once overcome, intelligence received on the west coast of Ireland migh
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