Deep-sea sounding and dredging; a description and discussion of the method and appliances used on board the Coast and Geodetic Survey Steamer, "Blake. (1880) (14778860101)

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

Text Appearing Before Image:

plicity.For general work, the plan adopted for the Blake is probably better.When the reel takes the full strain on the rope in hauling back greatstrength is needed to resist the crushing force accumulated upon the drum,and to adapt a reel capable of holding four or five thousand fathoms ofrope to this strain would involve an increase in its weight by no meansdesirable, either for paying out rope or for planting on a vessels deck. The Blakes reel, which has held 4,200 fathoms of the steel dredge-rope, is best shown on Plate 32. The drum or barrel is of boiler-iron, threefeet six inches long, two feet in diameter, and riveted to fillets on the twocast-iron side-plates. The depth of the flanges, above the drum, is onefoot. The side-plates are made with spokes, but would be better if solid.The friction-band is of wrought-iron, lined with maple one inch thick. The standards are of cast-iron and are higher than need be. Theywere designed when it was intended to wind the rope by means of the

Text Appearing After Image:

r> DREDGING AND TRAWLING—APPARATUS AND METHODS. 157 hand-cranks. When a steam-engine is used for winding, the reel shouldbe set as low as poss-ible for security against the rolling of the vessel.In designing standards for a leel it must be remembered that they shouldbe adapted to withstand violent jerks. The axle of the Blakes reel isof wrought-iron two and seven-eighths inches in diameter, reduced to twoand five-eighths inches in the journal-boxes. The axle should have abearing on both sides of each journal-box in order that the lateral strainmay come upon both standards at each roll of the vessel. The friction-lever is of the double-acting kind; that is, both ends of thefriction strap or band are l)olted to the lever, one on each side of the pivot. Neither the friction-score nor the bearing surface of the friction-bandshould be lubricated with oil. Water may be used, if necessary, to pre-vent the wood lining from taking tire, but it should be applied at intervalsfrom the first,

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1880

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