A DEEP-SEA BACTERIOLOGICAL WATER-BOTTLE. 



527 



lever projects through the top plate ; a broad messenger dropped down 

 the wire drives this projection downwards and disengages the lower 

 end of the lever from the hole in the top of the short rod I, allowing 

 the upper washer plate to fall. Another longer rod, not shown, is 

 similarly fixed to the lower washer plate ; it passes freely through 



Fig. 2, 



Fig. 3. 



holes in the various plates and guides and engages with a second bent 

 lever. The position of these two levers with respect to one another 

 and the side frames is shown in Fig. 2. They project through the 

 top plate at unequal distances from the centre, the inner one engaging 

 with the long rod fastened to the lower washer plate. To prepare 



the water-bottle for use the lower 

 n washer plate is lifted slightly, so 



that it presses against the glass 



lining ; alcohol (95 %) is then 



poured in, and the cylinder further 



raised until it is closed by the upper 



washer ; the inner lever is now made 



to engage with the longer rod, and 



the outer one with the short rod / ; 



this closes the bottle tightly. It is 



now lowered to the required depth, 



and the first messenger (the inner, 



smaller one in Fig. 4) is dropped 



down the line. This disengages the 

 lever holding up the longer rod, but is not wide 

 enough to touch the other. The lower washer 

 plate falls to the bottom of the frame, and the 

 cylinder also falls, but not so far, until it is stopped by the lock 

 nuts on the lower end of the rod I. It is now open widely at each end, 



NEW SERIES.— VOL. IX, NO. 4, MARCH, 1913 2 M 



J 



Fig. 4. 



