Title: Science of the sea. An elementary handbook of practical oceanography for travellers, sailors, and yachtsmen
Year: 1912 (1910s)
Authors: Challenger Society Fowler, G. Herbert (George Herbert), 1861-1940
Subjects: Oceanography Ocean
Publisher: London, John Murray
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library
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Fig. 196.—Small Nipper Fig. 197.—Small Nipper Rendering. Gripping. (Figs. 195 to 197 by permission of Messrs. Bullivant.) A recording sheave (odometer) of some kind is neces-sary for work in deep water. This need only consistof a strong sheave of known circumference (1 or | SOUNDING 277 fathom), to the spindle of which is affixed an ordinaryengine-room counter. For working heavy vertical ormid-water nets this sheave may be bolted to the deck,but for work of a lighter character it may be slungfrom a davit in place of the ordinary snatchblock. Ifnecessary a single turn of the wire may be taken rightround the sheave, but this tends to chafe strandedwire. For bottom trawling the recording sheave isscarcely necessary, A sufficiently good estimate of theamount of warp paid out can always be made by eyeor by counting the revolutions of the drum, makingallowance for the thickness of a heavy wire, if appreci-able in comparison with the sheave. All rollers and sheaves should be brass-bushed
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