Identifier: deepseasoundingd00usco (find matches)
Title: Deep-sea sounding and dredging; a description and discussion of the method and appliances used on board the Coast and Geodetic Survey Steamer, "Blake."
Year: 1880 (1880s)
Authors: U.S. Coast and Geodetic Survey Sigsbee, Charles D. (Charles Dwight), 1845-1923
Subjects: Blake (Ship) Deep-sea sounding Dredges
Publisher: Washington, Gov't Print. Off.
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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2 103 0 53.0 speed heing 6.6 knots. 100 fathoms came 1,500 4.5 74 76 77 1 19.0 upon the reel in 3 lO*; but on attempt- 1,750 6.5 105 108 110 0 54.7 ing to reel in the second 100 fathoms at 1,750 3.6 75 77 78 1 38.7 the rate of about 3™, the vessel going 2,000 7.3 125 126 128 0 48.7 at the same speed as before, the wire 2,000 3.7 75 78 79 1 36.0 parted—a fair break, and not in a splice. It is seen that when the wire parted it was being hauled through thewater, with the lead and stray-line attached, at a speed of 8.57 knots per.hour or one hundred and forty-four and three-fourths fathoms per minute,which is at the rate of one hundred fathoms in 41.4 seconds. When therewere 2,000 fathoms out, and the vessel was making a speed of 7.3 knots,the wire, line, and lead were being towed at the rate of one hundred fath-oms in 48.7 seconds, yet the maximum strain upon the wire was only onehundred and twenty-eight pounds, of which about forty-five pounds weredue to the stray-line and sinker. 1
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THE SOUNDING-MACHINE AND ITS USE. 83 Although the table shows that an accumulator, as such, is not requiredwhen reeling in while steaming ahead, yet as a dynamometer it wouldperform important service. The dynamometer, by showing the strain uponthe wire at each instant, would permit a safe and rapid rate of reeling inwithout a resort to time-interval checks involving a considerable calcula-tion, or to the use of prepared tables; and should sea-weed or other mat-ter held in suspension below the surface of the water foul with the lead orsounding-rod the fact would be made known at once by the dynamometer. In the performance of the operation under discussion the main objectwould be to get the vessel as far ahead on her course as possible; while thetime consumed in reeling in would be of secondary importance, and needbe limited only by the time required to reach the next sounding station. If in the time that otherwise would be occupied by a vessel in reelingin with the wire vertical, she c

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