Science Progress in the Twentieth Century, Vol. 7

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Excerpt from Science Progress in the Twentieth Century, Vol. 7: A Quarterly Journal of Scientific Work and Thought, July 1912 to April 1913 By the range of the tide at a place is meant the excess of the depth of water available at high-water for ¿oating a ship at the place above the corresponding depth at low-water. Until recently measurements Of the range of the tide were made only at places close to the coasts. They are, in fact, among the results furnished by the use of a tide-gauge. It was supposed, chie¿y on theoretical grounds, that the range of the tide in the open sea was much smaller. For a complete understanding of the tides, it is desirable to ascertain the range in the Open ocean and in partially enclosed seas, such as the English Channel, by direct Observation. It appears that ordinary methods of sounding are not available for this purpose and new instruments have been specially devised, one by Captain Adolf Mensing Of the Imperial German Navy, the other by Admirals Mostyn Field and purey-cust. The preliminary results obtained by the use of the instrument due to the latter are very striking, a range of tide in the Channel amounting to no less than 24 ft. Having been measured at a place about midway between Beachy Head and Dieppe. Systematic Observations Of this kind may be expected to throw much light on the nature of tidal oscillations. The extent to which the tide wave in the Atlantic Ocean, for instance, is an oscillation generated in that ocean by the direct action of the Sun and Moon, as contrasted with a progressive wave, generated in the Pacific and Southern Oceans and entering the Atlantic betweeen the promontories of South Africa and South America, is in some degree a matter of controversy. The systematic study of the tides in the open ocean, as distinct from the ebb and ¿ow along the coasts, may be expected to go far towards settling the question, the whole value of the method of cotidal lines, as developed by Airy and Whewell, depends upon the answer that may be obtained. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.