or through cw . A second, lightweight portable unit with 

 transducer is available for the supporting surface vessel. 

 A third and more powerful unit (300 watts) is now being 

 constructed which will provide not only greater trans- 

 mission range but also distance ranging information not 

 now available to the bathyscaph crew. In this way the 

 bathyscaph operator will be able to tell how far away the 

 transmitting station is located, though he will not know 

 its bearing. 



Topside Telephone 



While on the surface, communications between the 

 sphere and the conning tower are maintained through a 

 telephone circuit. The topside unit is located in a water- 

 proof box in the conning tower and consists of the phone 

 handset, buzzer switch, and buz zer. Inside the sphere, 

 there is essentially the same equipment. Prior to diving, 

 the topside unit is unplugged and taken to the supporting 

 vessel. The unit in the sphere remains in place at all 

 times. Through the use of this unit, rapid communication 

 can be made while surfaced between topside and the 

 personnel in the sphere even after the sphere door has 

 been closed. 



Motor Control 



This system consists of a panel containing the controls 

 for all five propulsion motors. The switching arrangement 

 for each motor consists of an energizing switch for the 

 circuit, a switch that removes the starting resistance from 

 the circuit, a rheostat used for building up motor speed 

 and, finally, a reversing switch. 



Lighting Control Panel 



This panel controls all the external lighting except for 

 the Edgerton stroboscopic lights which are controlled through 

 the external camera panel. The lighting panel is so arranged 

 that each light cluster of five NEL lamps and each Edgerton 

 300-watt unit can be controlled separately. In this way, 

 maximum flexibility is afforded. 



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