Deep-sea sounding and dredging; a description and discussion of the method and appliances used on board the Coast and Geodetic Survey Steamer, "Blake." . may be turned easily and delicately with the left hand whenthe right hand is engaged with the brake-lever. On the hub of the winch-head is a steel worm to engage the gears ofa register like that shown on Plate 38, The register gives, approximately,the number of fathoms of dredge-rope payed out. On the after end of the crank-shaft, outside of the fly-wheel, is a smallwinch-head for general use. The crank-shaft is forged in one piece, andboth t
Deep-sea sounding and dredging; a description and discussion of the method and appliances used on board the Coast and Geodetic Survey Steamer, "Blake." . may be turned easily and delicately with the left hand whenthe right hand is engaged with the brake-lever. On the hub of the winch-head is a steel worm to engage the gears ofa register like that shown on Plate 38, The register gives, approximately,the number of fathoms of dredge-rope payed out. On the after end of the crank-shaft, outside of the fly-wheel, is a smallwinch-head for general use. The crank-shaft is forged in one piece, andboth this and the winch-head shaft are of the best wrought-iron. Thejournal-boxes, connecting-rod boxes, and link-blocks are of compositionmetal. All pins for valve-motion are of steel, and all parts of the engineare made extra strong to withstand violent shocks. The engine may be run fast or slow according to the work to be done,and under the complete control of one man. The pressure of steam is usually sixty pounds. The exhaust leadsinto the condenser of the main engine. The cost of the hoisting-engine, fitted in place and in running order,was $1, DEEDGING AND TRAWLING—APPAEATUS AND METHODS. 159 Tue mfi«iiii»-e«ffi»ie,—This is of the same general description as thehoisting-engine. It has two six-inch cyhnders and is single-geared tothe axle of the dredge-reel. It is fitted with reversing and clutch leversarranged for locking in position. Engine and reel are under the controlof one man. The cost, placed on board and in running order, was $485. THE SWINGING BOOM. This is so clearly shown by the heliotype views that an extendedexplanation of details is not needed. It was forty-seven feet long andfourteen inches in its greatest diameter. The metal fittings and fasten-ings were of wrought-iron. The topping-lift was of three-inch manila,rove through iron-strapped blocks made extra strong. The pendant wasof 4J-inch manila. The small block at the boom-end was of a well-knownco
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherwashingtongovtprin
