THE BATHYSPHERE OF1930 233 



it was simply necessary for the divers to direct the deck 

 crew to speed up the generator. The hght was turned out 

 by the divers when they wished to observe the effects of 

 the natural submarine illumination. To facilitate these ob- 

 servations the entire interior of the sphere was painted 

 black. 



The small conductors passed to the telephone lent by 

 C. R. Moore of the Bell Telephone Laboratory. The two 

 sets were run by a twenty-two and a half volt radio battery 

 on deck. At times static occurred, especially when the free 

 ends on the conductors were disturbed, but on the whole 

 they were a success. All observations taken in the depths 

 were recorded by the deck crew. 



The breathing apparatus was designed by Dr. Alvin 

 Barach of New York. On either side clamped to the wall 

 an oxygen tank was carried, either of which would take 

 Dr. Barach's special valve. We set this valve to allow two 

 litres of oxygen per minute to escape for the two divers. 

 One tank lasted about three hours at this rate. Above each 

 tank was a wire mesh tray. One contained soda lime, which 

 took up the CO2, the other calcium chloride, which ab- 

 sorbed the moisture. Palm-leaf fans kept air in circulation. 

 During our deepest dive of fourteen hundred feet we were 

 comfortable and cool, although we had been inside more 

 than an hour and a half. 



For lowering the bell, we used Dr. "William Beebe's seven- 

 ton winch and special large reel. To operate these, we in- 

 stalled two boilers on the after part of the long deck of 



