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Bird & Son, Duke St., Cardiff. Lackland, East Holborn, S. Shields. McGregor, William St. Greenock. Aberdeen, Belfast, Bristol, Dundee, Falmouth, Glasgow, Greenock, Hull, Leith, Liverpool, Limerick, Milford, Newcastle, North Sheilds, Swansea, Southampton, Waterford, Whitehaven. The Monthly Parts and back Numbers of the Nautical Magazine can be had at the above Agents and Custom Houses; also sets of Seven vol. from 1839 to 1845, half cloth, £1 5s. Od. Shipping and Mercantile Gazette. LONDON DAILY EVENING JOURNAL. OFFICE: No. 54, GRACECHURCH ST., CITY. As an Evening Newspaper, the Shipping and Mercantile Gazette, has for many years held a prominent position among its Metropolitan Contempories; and as an authority on Commercial affairs its value and importance are fully established. FOR NAVIGATION FROM ENGLAND TO THE RED SEA, BOMBAY, BENGAL, CHINA, &c. Regulations for the Examination of Masters and Mates in the Merchant Service, price 2d. 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Bashee Islands, by Horsburgh, 3s. 6d. The East India Pilot, Capt. Horsburgh, and J. Walker, folio, half bound, £15. 5s. The Indian Directory; or, Directions for Sailing to and from the East Indies, by James Horsburgh, Esq., F.R.S,, &c., Sixth Edition, 2 vols. in 1, 4to., bound in cloth (in the press) £4. 69. LONDON: WH. ALLEN AND CO., 7, LEADENHALL STREET. AN INVESTIGAtion of the TIDES BETWEEN the Owers AND PORTLAND, FROM OBSERVATIONS MADE DURING the progress of the SURVEY ON THE SOUTH COAST OF ENGLAND.-By Captain Sheringham, R.N., Admiralty Surveyor. THE following paper on the marginal tidal streams of the English Channel by Capt. Sheringham, R.N., whose zeal and intelligence peculiarly fit him for prosecuting such an enquiry, is a valuable contribution to hydrography. A correct knowledge of the inshore set of the Channel tides was required for completing the examination of its tidal streams, which had been so successfully commenced by Capt. Beechey, R.N., the result of whose enquiries has been communicated to the Royal Society in two papers of considerable interest; one of which we have already noticed in our number for February 1849, and the other we hope shortly to present to our readers. As Capt. Sheringham, has adverted to the subject, we may here briefly state that these papers advocate a system of tidal streams peculiar to channels, in which a combined wave is formed by the meeting of two tidal waves from opposite directions, such as Capt. Beechey has shewn to be the case in the English Channel and in the Irish Sea. In channels so circumstanced it is found that the turn of the stream, instead of being progressive as was hitherto supposed, takes place nearly simultaneously throughout, and that the times of slack water coincide nearly with the times of high and low water at the apex NO. 8.-VOL. XX. 3 E |