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JESSE RYDER Rock.—The position of this reported danger (in lat. 46° 29' N., long. 49° 41' W.) was carefully examined throughout one day, but no indication of it was found either by variation in the soundings, or change in quality of the bottom.

BERTEL BANK.—The position assigned to this bank (lat. 44° 43' N., long. 49° 52' W.) was also carefully examined, but no sign of it was found.

Note.—The masters of various fishing vessels, who have had many years experience on the Great Bank of Newfoundland, stated that to their knowledge, no trace of shoal ground exists near the reported positions of Jesse Ryder rock and Bertel bank.

The United States Hydrographic Office has also recently published a “Sketch of the Eastern Shoals,” based on information derived from the most responsible and trustworthy of the fishermen on the Great Bank. The accompanying copy of this sketch has been obligingly furnished to us by Messrs. Imray and Son, Chart Publishers, 89, Minories.

The Nine-Fathom patch, together with other spots supposed to be shoaler than the general soundings of the locality, is laid down on the sketch, which otherwise sufficiently explains itself, and will be found useful to masters navigating this part of the Atlantic. The approximate position of the Nine-Fathom patch is lat. 46° 25' N., long. 50° 32' W.

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WATER-TIGHT BULKHEAD DOORS.

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HE sinking of so many

vessels after collision, owing to the difficulty

in closing the watertight doors of compartments, has of late directed general attention to the means now in use with a view to accelerating the process, and many different arrangements, including even the use of hydraulic gear, have been brought forward. Mr. C. R. Simey, of Sunderland, has introduced a plan by which the closing apparatus is rendered entirely unnecessary, as he proposes to keep the doors always closed, except when it is necessary for any one to pass through, in which case he opens the door and closes it after he enters the next compartment. To effect this, Mr. Simey, in the most simple manner possible, balances the door in a similar manner to a window, so that no great energy is required to open or close it. In the accompanying plan D represents the door when open, W is the balance weight which is connected to the door by a chain passing over the pulley P. The door works as usual within the frame F, and can be worked from the upper if required by the rod R. If it is necessary to lock the door when shut, this can be done by tightening against the

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