. Science of the sea. An elementary handbook of practical oceanography for travellers, sailors, and yachtsmen. 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
. Science of the sea. An elementary handbook of practical oceanography for travellers, sailors, and yachtsmen. 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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Keywords: ., bookcentury1900, bookdecade1910, booksubjectocean, bookyear1912
