A wooden derrick (D), provided with topping lift and guys, was mounted on the foremast by means of a band and goose-neck. At the outer end of the derrick, the dynamometer and a fourteen-inch block were attached. The maximum strain which could be supported was ten tons. In paying out, the wire was led from the head of the derrick to a snatch-block on the quarter (E), constructed so as to admit of its disengagement from the wire when it was necessary to heave in. This block kept the wire clear of the propeller and allowed us to have the vessel moving slow or fast as required, while the trawl was being paid out. The positions of the various parts of the trawling gear are shown in the plan on the opposite page.
[TEXT ILLUSTRATION]
Plan illustrating the arrangements for deep-sea trawling on board the 'Aurora'.
Before trawling in deep water the vessel was stopped and a sounding obtained; then the derrick was hoisted, the wire rove through the various blocks, the trawl shackled on, and the men distributed at their stations. When all was ready, the engines were put at half-speed (three knots), a course was given to the helmsman and the trawl lowered into the water. When it was flowing nicely just astern, the order, "Slack away," was given; the wire being paid out evenly by means of the friction-brakes. In one thousand five hundred fathoms of water, after the two-thousand-fathom mark had passed out, the order was given, "Hold on and make fast." Speed was now reduced to one and a half knots and the wire watched until it gave a decided indication of the trawl dragging over the bottom. The strain was now taken by the windlass-barrel, controlled by a screw-brake, backed if necessary by a number of turns round the forward bitts. A slow drag over the bottom was generally continued for one hour. The engines were then stopped, and the order came, "Stand by to heave away." This was quickly followed by "Knock out," which meant the disengaging of the after-block from the wire and allowed the vessel to swing round head-on to the wire. "Vast heaving" indicated the appearance of the net at the surface, and, when the mouth of the net was well above the bulwarks the derrick was topped up vertically, the lower part of the net dragged inboard and the cod-end untied, the catch being thus allowed to empty itself on deck. The contents of the haul supplied the biologists with the work of sorting and bottling for the next twelve hours or more.
The form of trawl used on board the 'Aurora' was known as a Monagasque trawl, of a type employed by the Prince of Monaco. As will be seen from the sketch, it is of simple construction and possesses the advantage of having both sides similar so that it is immaterial which lands on the bottom.
The winter cruise in the Sub-Antarctic began on May 18, 1912, after we had refitted in Sydney and taken on board all the oceanographic apparatus, during the previous month. Leaving Port Jackson, we proceeded to Port Kembla, N.S.W., and took in four hundred and eleven tons of coal.
The following was the personnel of the ship's officers on this and the two following cruises: Chief Officer, F. D. Fletcher; Chief Engineer, F. J. Gillies; Second Officer, P. Gray; Third Officer, C. P. de la Motte.
During the first dredging cruise, Mr. E. R. Waite, from the Canterbury Museum, Christchurch, was in charge of the biological work.
My plan was to go through Bass Strait and then to sail towards the Royal Company Islands as given on the French chart, before heading for Macquarie Island. From thence we should steam across to the Auckland Islands. At both the latter places Mr. Waite would be able to secure specimens. It was not expected that the weather would permit of much trawling, but we anticipated some good soundings. As a matter of fact, sub-antarctic weather in the winter may be predicted with some certainty: strong winds, heavy seas, much fog and general gloom.
We had a fine run through Bass Strait with a light south-east breeze, arriving off King's Island at noon on May 28. The trawling gear was got ready for the following day, but the sea was too high and the ship continued south towards the position of the Royal Company Islands.