SUBMAIUSE LIGHT. 253 



by llie heat, escape by means of a little valve analo- 

 gous to that used in the artilicial lung. 



The regularity of the light thus obtained depends 

 only on the regnhitor itself, and not at all on the 

 depth ; it will maintain its energy for about three 

 hours, and then it is only necessary to (hinge tie 

 carbon-points. 



Fig. 47. — Divere finding a Box of" Gold in the Port of Marseilles. 



Divers are very generally employed to recover 

 things which have fallen into the sea. How many 

 valuable objects have been rescued from the ocean 



