244 THE BATHYSPHERE OF 1 9 34 



are exactly the same as those used in 1932. They were sup- 

 plied by the Bell Telephone Company through Mr. C. R. 

 Moore, and are the same type as those used by transoceanic 

 telephone operators. 



Electrical Equipment in the Bathysphere: From the 

 communication cable that enters the bathysphere through 

 the stufSng-box, two electric wires lead to a switch box 

 immediately* above the central window. This box is wired 

 so that the current can be distributed through two switches 

 on the front of the box, — one for control of the light and 

 the other for the chemical blower. 



The wire for the chemical blower passes from the switch 

 around the upper right hand side of the sphere on a series 

 of hooks welded to the metal, until it reaches the blower 

 motor. 



Lamp: From the light switch, which is of 20 amperes' 

 capacity, two wires lead down to the searchlight. This is 

 a suitable housing with condensing lens and contains a 

 1500 watt 1 10-120 volt lamp. Under usual conditions this 

 lamp operated, because of the reduction in voltage due to 

 the resistance of 3600 feet of cable, at from 72 to j6 volts. 

 The intensity of its light was thus reduced from 33,000 

 lumens (2628 candlepower) at no volts to 9020 lumens 

 (732 candlepower) at 75 volts. This lower amount sup- 

 plied abundant light for visual purposes from the bathy- 

 sphere. 



When greater illumination was needed for photography. 



