Discovery reports (1929) Discovery reports discoveryreports11929inst Year: 1929 2o8 DISCOVERY REPORTS wire pays out from the drum of the winch, and the gear can often be recovered without serious damage. The nipper was made by BulHvant and Co. and is of the type illustrated in the figure quoted above. It has a double cam action and releasing plate, and the jaws have two grooves to suit i| and ij in. wire. Another type, with grooved brass wedges driving into a steel casing, was tried, but could not be made to grip the wire satisfactorily. A smaller nipper, also with cam action, and with brass
Discovery reports (1929) Discovery reports discoveryreports11929inst Year: 1929 2o8 DISCOVERY REPORTS wire pays out from the drum of the winch, and the gear can often be recovered without serious damage. The nipper was made by BulHvant and Co. and is of the type illustrated in the figure quoted above. It has a double cam action and releasing plate, and the jaws have two grooves to suit i| and ij in. wire. Another type, with grooved brass wedges driving into a steel casing, was tried, but could not be made to grip the wire satisfactorily. A smaller nipper, also with cam action, and with brass interchangeable jaw plates, was occasionally used for the 4 mm. and 6 mm. wires; but the simple screw-clamp, shown in Fig. 26, was at least as easy to manipulate. With these light wires the nipper or clamp was for the most part only required when some misadventure made it necessary to take up the outboard strain. Fig. 26. Simple screw- clamp for light wire ropes. Fig. 27. Hand harpoon with swivel head. Hand-Nets, Harpoons, etc. Hand-nets and lines were of course frequently employed and a sort of mussel rake, with heavy teeth and a triangle of wire netting extending from the cross- piece to the handle, was useful for collecting organic growth attached to hulks and to the piles of jetties. Equipment for obtaining porpoises and dolphins was taken, including a small har- poon gun of the type used in hunting the bottle- nose. The hand harpoons were provided with a swivel head, as shown in Fig. 27, which gives a very effective grip: in use one end of the head is tied back to the shaft with a piece of thin twine. WHALE-MARKING As already explained (p. 147), one of the objects for which the 'William Scoresby' was built was to undertake whale-marking—the only means by which the niigrations of whales can be traced with any certainty. Preliminary experiments made in 1925 in- dicated that the best way of attempting to mark whales would be by shooting a mark into the blubber. An ordin
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