. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. io8 DISCOVERY REPORTS of Stout log-line and later of soft 2 in. circumference tarred hemp known in Admiralty dockyards as "Rumbo", has been replaced by a flat braided sennet, or webbing, of exceptional strength. This material has given every satisfaction, never taking turns in the water and interfering with the efficiency of the net as the " Rumbo" line was inclined to do. In the ' Discovery' experiments the N 450 was towed horizontally,^ at that time the common practice with
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. io8 DISCOVERY REPORTS of Stout log-line and later of soft 2 in. circumference tarred hemp known in Admiralty dockyards as "Rumbo", has been replaced by a flat braided sennet, or webbing, of exceptional strength. This material has given every satisfaction, never taking turns in the water and interfering with the efficiency of the net as the " Rumbo" line was inclined to do. In the ' Discovery' experiments the N 450 was towed horizontally,^ at that time the common practice with most if not all types of towed net, particularly those of larger size. Although it had worked well when fished open, yielding substantial catches in first-rate condition, as a closing net the N 450 met with little success. For closing, the familiar Nansen method was used, but even when all difficulties in the actual operation had eventually been overcome the results were never satisfactory: the volume of the catch was in most instances disappointingly small, the material often in poor condition and occasionally damaged so badly as to defy Fig. I. Plan of 4I m. net showing principal measurements and main structural features (after Kemp and Hardy). A, cylindrical non-catching part of i| in. mesh netting, 50 ft. in circumference. BCD, conical catching part tapering to a circumference of 3 ft. at e, with meshing as follows: B, | in., C, 7 mm., D, 7 mm., Hned at the cod-end with finer 4 mm. material, e, canvas cylinder to slip over bucket; /, canvas band; g, longitudinal webbing supports; /;, bridles; r, net ring, 450 mm. in diameter, 50 ft. in circumference. The curious poverty of material in the closing net gave rise to the somewhat dis- turbing view that a large proportion, perhaps the majority, of the animals captured in a big open net fished horizontally might be taken not from the restricted horizon at which the net was fishing, but during its ascent towards
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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
