Deep-sea klingende und Ausbaggern; eine Beschreibung und Diskussion der Methode und Geräte an Bord verwendet die Küsten- und Vermessungsamt Steamer, "Blake.". 168 Deep-sea klingende und DEEDGING. Abmessungen der TABI, E-Sieb. Hauptrahmen: Höhe bis Oberkante Länge Breite Breite der Seite - stücke Dicke Seite - Stücke.. Hopper-Rahmen: Breite der Seite - stücke Länge unten Länge oben Breite unten Breite oben. 37 Diese Form der Sieb, i.e. seine primäre Form, erfunden wurde von Atz. H. in der 0. Chester unddie Verfasser im Jahre 1877, aber es wurde bald danach muchimproved durch die Zugabe des Canvas Tasche und pipeb

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Deep-sea sounding and dredging; a description and discussion of the method and appliances used on board the Coast and Geodetic Survey Steamer, "Blake." . 168 DEEP-SEA SOUNDING AND DEEDGING. DIMENSIONS OF TABI, E-SIEVE. Main frame: Height to upper edge Length Breadth Width of side-pieces Thickness of side-pieces..Hopper-frame : Width of side-pieces Length at bottom Length at top Breadth at bottom Breadth at top. 37 This form of sieve, iu its primary form, was invented by Oapt. H. 0. Chester andthe writer in 1877, but it was soon afterwards muchimproved by the addition of the canvas bag and pipebeneath it, which were devised by Mr. Smith, the execu-tive officer of the Speedwell. The original use of this sieve was to receive thecontents of the trawl, instead of emptying it on deck, as had been done previously; but its advantages weresoon found to be so great that it has also been used forwashing the contents of the dredge whenever the quan-M.—The Table-Sieve. tity of mud was considerable. The legs are made of unequal lengths, to correspond with the curvature of the deck.. CHAPTER YI. NAVIGATION AND KECOEDS. DEVISING A SYSTEMATIC RECORD. Until the records of the Blakes work were systematized in the man-ner to be described in this chapter, deep-sea parties of the Coast Survey hadnot been required to render to the office a detailed record of navigation; thework having been more or less desultory, there had been no general con-formance to a fixed system of record analogous to that demanded of inshoreparties, and the results of the navigators observations and computations fordetermining positions had usually been accepted as correct. On joining thevessel I was the bearer of instructions from the Superintendent to my pre-decessor in command to submit to the office, with other records, the data usedby the navigator in fixing the positions of soundings. While CommanderHowell was still in charge forms for computation, containing the arrange-ment of data shown below the headings

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• bookcentury1800
• bookdecade1880