DIVING BELLS. 271 



extent as that in the glass, the water still leniaiiiing 

 at the same level. Compress this somewhat more, 

 it drives the water from the gla^s, which it tills. This 

 is precisely what happens in the diving-bell. 



Fig. 52.— Diving Bell. 



While the bell descends the workmen are supported 

 on transverse benches. Havino^ reached the bottom, 

 the air from the pump drive s out all the water from 

 the. bell, and the men can then leave their seats and 

 commence work. As they cannot leave the bell, 



