Présentation de l'éditeur
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.1 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. 1T he more extreme discrepancies are due partly to accidents in the working of the tubes, partly to irregularities in their bore.
(Typographical errors above are due to OCR software and don't occur in the book.)
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