Deep-sea sounding and dredging; a description and discussion of the method and appliances used on board the Coast and Geodetic Survey Steamer, "Blake." . SorNDING-ROD A Detacher. 44 DEEP-SEA SOUNDING AND DEEDGING. the latter being provided for by the apertures P, P, &c.* On hauUngback, the valve drops to its seat, or is forced back by the spiral spring H,and the cone falls, closing the upper apertures against a current of waterthrough the cup. When the rod is recovered the specimen-cup may beunscrewed for extracting the bottom material (Plate 3) .f * Experiment has shown of late that
Deep-sea sounding and dredging; a description and discussion of the method and appliances used on board the Coast and Geodetic Survey Steamer, "Blake." . SorNDING-ROD A Detacher. 44 DEEP-SEA SOUNDING AND DEEDGING. the latter being provided for by the apertures P, P, &c.* On hauUngback, the valve drops to its seat, or is forced back by the spiral spring H,and the cone falls, closing the upper apertures against a current of waterthrough the cup. When the rod is recovered the specimen-cup may beunscrewed for extracting the bottom material (Plate 3) .f * Experiment has shown of late that it would be a m. C.—Belknap Sounding-cylinoer No. 2. 1 improvement to do away with the stud which projectsfrom the lower part of the poppet-valve, leaving theunder surface of the valve smooth. 11 give herewith a wood-cut showing, in sec-tion, the original cylinder No. 2 by Captain the use of a poppet-valve in a specimen-cupis not original with Captain Belknap, my intentionwas directly to modify his cylinder. The descriptionalready given of the modified rod will suffice to explainthe original. I had at first only referred to a publica-tion wherein a drawing of the original No. 2 might befound, but since Captain Belknap has stated that hedoes not think my changes improvements, it seemsdue to him that his cylinder should be given a graphicrepresentation on these pages. It is also proper thatthe alterations should stand or fall according to theirmerit. The changes made by me in the rod properor cylinder are, briefly, as follows: Substituting acone top for that shown in the wood-cut; dis
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherwashingtongovtprin
