PHYSICAL OCEANOGRAPHY 



2.^,1 



(E) is hinged on to the rod. In the left-hand figure the plate 

 is tilted upwards, and it remains in that position while the 



C.^^ — ^- 



^ 



Fig. i6i.— Buchanan's Stopcock Water-Bottle. 



apparatus is' being lowered. But as soon as it is pulled upwards 

 the water presses against the plate, tilting it into the position 

 shown in the middle figure ; the rod is then forced downwards, 



