Ballast Control Panel 



The ballast control panel consists of the necessary 

 switches to energize the ballast tub holding magnets for 

 control of the dropping of ballast. In addition, switches 

 are provided to reverse the polarity in both circuits in the 

 case of failure due to residual magnetism. The flow of 

 shot is measured by use of two electrically activated stop- 

 watches. When the spring-loaded switch is depressed to 

 drop ballast from a tub, the stopwatch automatically turns 

 on and remains on as long as the switch is depressed. In 

 this way, a cumulative time count is obtained, and it is 

 an index of the amount of ballast that is dropped from each 

 tub. The ballast falls roughly at a rate of 2 5 pounds per 

 second per tub. 



Electrical Checkout Panel 



The function of this panel is to permit the pilot of the 

 bathyscaph to check the current and voltage in each of the 

 key control and instrumentation circuits. Through use of 

 rotating switches, each circuit may be read to ascertain 

 its exact state. 



External Camera Panel 



This panel contains the necessary equipment for 

 manual and automatic operation of the external Edgerton 

 cameras and stroboscopic light units. In addition, it permits 

 the synchronization of the interior still cameras with the 

 external stroboscopic lights. The manual mode is operated 

 by pressing a small switch. The automatic feature is 

 operated by a low speed motor which automatically makes 

 and breaks the contact in the circuit at approximately 15- 

 second intervals. 



Temperature Recording 



The temperature recording system consists of a 

 Varian dual-pen recorder which is capable of printing a 

 continuous temperature profile from the surface of the 

 ocean to the sea floor in two modes. The coarse mode 



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