Physical Laws Underlying the Scale of a Sounding Tube (Classic Reprint)

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Excerpt from Physical Laws Underlying the Scale of a Sounding TubeIn finding the depth to which the sounding tube has been sub merged, no correction need or should be made for the fact that the crest of a wave has passed over the spot where the tube lies, and that its maximum depth below the instantaneous surface is therefore greater than the depth below the mean surface of the water, which is the depth commonly desired. This statement applies to surface waves such as are raised by the wind, and whose length (distance from crest to crest, or from trough to trough) is less than the depth Of the water, and whose amplitude is small compared with the depth, for it is well known that the oscillatory effects of such waves die out very quickly as the depth below the surface increases, and that the water pressure at the bottom Under the trough, or under the crest is the same, being equal to the static pressure due to the depth below the undisturbed mean surface. The statement does not apply to long waves like tidal waves, tidal wave being used in its proper sense of a periodic wave produced by the attraction of the sun or moon. Depths found by the sounding tube are to be corrected for the stage of the tide in the same way as are soundings taken with the lead.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.