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 Tube The use of the sounding tube, or depth recorder, has long been recognized as a convenient and rapid method for getting approximate soundings in depths of 100 fathoms or less. It has never been considered an instrument for accurate surveying, and, indeed, the depths shown by two tubes of different patterns thrown overboard at the same point, or even by two tubes of the same pattern, have often exhibited surprising discrepancies. Moreover, it does not appear that the method used in graduating tubes in current use has ever been published in detail. It is the purpose of this paper: (1) To provide as correct a scale as possible for the sounding tubes of the new Coast and Geodetic Survey type, the scale to be computed on assumptions definitely stated and by a stated formula, (2) to provide a method of correcting the depths as read directly from the scale for variations in temperature and in atmospheric pressure, so that the tube may be used in surveying as an instrument the precision of which is comparable with that of the lead, (3) to provide a compilation of physical data likely to prove convenient in a further study of the subject. This paper was nearly ready for publication two years ago, when the war delayed its completion. In the meantime, the first draft of the manuscript was read by the late Dr. R. A. Harris, of this Survey, and several suggestions were derived from his memoranda. Many of the tables were prepared with the help of the Section of Tides and Currents. 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.