THE SHIP AND ITS EQUIPMENT 39 



also Fig. 22), drives a big reel with 6000 metres of wire, 3.5 

 mm. in diameter, for the hydrographical instruments and the 

 Lucas sounding machine (6 and 5), and it can also be used 

 to drive the big centrifuge (10) by means of a hemp line. By 

 a similar arrangement the aft winch drives two drums with 

 2000 metres of wire, 3 and 4 mm. in diameter, for the vertical 

 nets and hydrographical work in moderate depths. 



In calm weather and when the currents are slight all the 

 appliances may be operated simultaneously, provided care be 



Fig. 21.— Side View of Arrangement of Gear on board the "Michael Sars." 



taken that one appliance, let us say, is lowered while others 

 are being hauled in. But when there are strong currents there 

 is always a danger of the appliances colliding, and it is best 

 in that case to work one at a time from each winch. 



For the larger nets and the trawl we use the big winch (i), 

 which takes tl>e long steel line, 9000 metres in length, increas- 

 ing from 34 mm. to 44 mm. in diameter. When trawling the 

 line passes round the big reel {9), on which there is a register, 

 and from there it is led to the gallows (12 and 13) and paid 

 out astern. When operating the big vertical nets, the line 

 is passed round a block in the accumulator, which hangs from 



