92 DISCOVERY REPORTS 



event of ice damage to the sides of the ship. This arrangement of oiltight bulkheads 

 proved most satisfactory when on one occasion the side plating in way of the bunkers 

 was badly damaged in the pack-ice, causing leakage in the wing bunkers. The centre 

 compartment remained intact, leaving the ship with sufficient reserve of oil fuel to en- 

 able her to reach her destination. The bunkers extend from the after end of the fore hold 

 to the stokehold bulkhead and are separated from the double-bottom fresh-water tanks 

 by oiltight wells at either end. The starboard side of the forward well houses the sluice 

 valve and hydrophone for the deep-water echo-sounding machine. The bunkers are 

 fitted with steam coils for preheating the oil in cold weather, and permanent steaming- 

 out pipes are fixed in each compartment. 



On account of the long periods likely to be spent at sea, the ship is designed to carry 

 approximately 140 tons of fresh water. Of this quantity about 10 tons is for drinking 

 purposes and is carried in four rectangular galvanized steel tanks at the after end of the 

 fore hold. The remainder is carried in the after peak ballast tank and in the fore hold, 

 stokehold and engine-room double-bottom tanks. 



At her trials on November 11, 1929, the vessel was tested over the measured mile in 

 the Gareloch on the Clyde. She exceeded her contract speed of 13 knots and easily de- 

 veloped and maintained her designed horse-power of 1250. Her consumption at full 

 speed is i2| tons per day; with full bunkers this speed can be maintained for 25 days, 

 giving a cruising radius of nearly 8000 miles. At an economic speed of io| knots her 

 consumption is about 7I tons per day. At this speed she can steam for 42 days and has 

 a cruising radius of about 10,500 miles. In practice, however, her cruising range is 

 considerably less than this, since, for the scientific work, the ship is normally hove to 

 for several hours every day. During these hours the consumption of fuel is not much 

 reduced although no distance is made. 



SPECIAL ACCOMMODATION FOR RESEARCH 



BIOLOGICAL AND HYDROLOGICAL LABORATORIES 



The positions of the biological and hydrological laboratories, amidships on the upper- 

 deck level, are shown in Plate V and they are illustrated in Figs, i, 2 and Plates VIII, IX. 

 The fore-and-aft bulkhead which separates them stops short of the common double- 

 door entry in the after bulkhead, which thus allows open communication between the 

 two. They receive natural light and ventilation by means of Stone's square pattern 

 watertight windows of which there are seven in the biological and five in the smaller 

 hydrological laboratory; they can be protected by mild steel storm shields in heavy 

 weather. The laboratories are electrically lighted by ceiling lights, an adjustable bracket 

 lamp over each of the working spaces on the benches and a large low hanging lamp over 

 the swinging table in the centre of the biological laboratory. In both laboratories the 

 walls are of white enamelled pitch pine, the bench tops of teak, and the chairs, cup- 

 boards and drawers of light oak. 



