Topside battery box 



powering the craft's five 3-horsepower electrical propul- 

 sion motors and for providing power to the lighting systems. 

 The fourth box is the power supply for the sphere and its 

 equipments. The external battery system is so organized 

 that it can be charged in place from a single point charging 

 connection. The following additional power supply systems 

 are also installed: 



1. 110 volt ac, 1000 watts converted from 24 vdc main 

 power available for instrumentation and scientific equip- 

 ment. 



2. 110 volts ac, 400 cycle converted from 24 vdc main 

 power for operation of the directional gyro. 



3. 12 volts dc provided by silver-zinc batteries carried 

 internally, for operation of the ballast release system. 



4. 15 volts dc provided by internally carried silver-zinc 

 batteries for operation of the ballast tub holding system. 



17 



