PEOFILE OF THE SEA SECTIONS OF THE NOETH ATLANTIC TELEGEAPH. fFrom the Mechanics’ Magazine, London, Feb. 15th, 1861.] At the last meetings of the Royal Geographical Society the subject discussed was the North Atlantic Telegraph. Among the speakers on that interesting occasion was Captain Sherard Osborn, R.N., the distinguished Arctic navigator. He first called the attention of the Society to the bottom of Hamilton Inlet, and stated that it was mud and shells. He thought there was eVery reason to believe that a cable once laid in that inlet would not be disturbed by icebergs. But the most striking part of this navigator’s remarks was that which referred to the favourable depths of the respective deep seas ; and in order to enable our readers to understand his ideas, we have had engraved the accompanying diagrams. Captain Osborn observed that the section between Scotland and the Faroe Islands was comparatively shallow. The deepest water found was but 254 fathoms, and the depths seem to be very uniform. The sea between the Faroe Isles and Iceland is deeper, but not exceeding 683 fathoms. On these two sections the depths are so moderate that the cables can be taken up and repaired if they should get out of order; and this fact is one of very great commercial importance. The next section is between Iceland and Greenland. This is the longest on the route, but at the same time its depths are very favourable. The deepest water is 1572 fathoms. There is but a short distance of this section over 1200 fathoms, and practical telegraph engineers seem to agree that a cable can be raised at that depth. In 1858 the Atlantic cable was let out in 2600 fathoms of water, with a lead over 100 lbs. weight attached, and it was drawn back again. We are informed that it is contemplated to submerge cables upon this route that can be taken up and repaired ; and it is believed that it will be possible to take up the entire line between Iceland and Greenland. The deepest section is between Greenland and Labrador, which at its greatest depth is 2032 fathoms.

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