THE SHIP AND ITS EQUIPMENT 



25 



brought head to wind by means of her engine to keep her from Method of 

 drifting off too much. With three or four heavy weio-hts of ^°""''^"§- 



Fig. 2.— Sounding and Trawling on board the "Challenger." 



50 kilos each attached, the sounding-lead was heaved, and the 

 apparatus was so constructed that the weights slipped off upon 

 reaching the bottom, thus doing away with the necessity of 

 hauling the entire mass up again. The Baillie sounding 



