THE BATHYSPHERE OF 1 9 34 243 



Each of the chemicals was supphed at the rate of about 

 one pound per person per hour. Extra containers of un- 

 opened chemicals were placed in the bathysphere for 

 emergency use. 



Temperatjire and Hiunidity Recorder: A small auto- 

 matic recorder made by Julien P. Friez and Sons gave us 

 a record of temperature and humidity conditions. This 

 instrument was especially useful in the first few dives in 

 showing that the quantity of calcium chloride theoretically 

 necessary for controlling the humidity in the bathysphere 

 was wholly inadequate. 



Telephones: The general layout of the telephone system 

 is the same as that of 1932. There is a complete outfit of 

 ear-phones and breast transmitter in the bathysphere. This 

 is plugged into a small box containing a coil and battery 

 and fastened to the left side of the sphere. The box in turn 

 is connected to the communication hose by wires that ex- 

 tend on a series of small welded hooks around the upper 

 rear side of the sphere. On deck there are two instruments, 

 each at the end of a fifty foot length of wire so that the 

 users can move freely to any part of the deck. A duplicate 

 set to that in the bathysphere, including battery and coil 

 box, is used by Miss Hollister for recording and com- 

 municating with the occupants of the sphere, while a sin- 

 gle ear-phone is at my command when I am in charge of 

 the deck operations. 



The telephone instruments are all new, although they 



