bathyscaph looking in a rearward direction. The monitoring 

 unit is inside the sphere and can be equipped with a small 

 robot-type camera so that pictures can be taken directly 

 from the viewing scope. The primary advantage of this 

 particular closed- circuit system is that it works with a 

 very low power supply (24 volts dc). The camera functions 

 well with a single 300-watt Edgerton lamp illuminating the 

 sea floor in the vicinity of the camera. A pan and tilt head 

 is planned for this unit in the future. 



Mechanical Arm 



The electromechanical arm used on TRIESTE was 

 constructed by General Mills Corporation, Minneapolis, 

 Minnesota. This arm is capable of all motions of the 

 human arm, but has only two fingers. It can cover an area 

 4 feet in diameter on the sea floor and is capable of lifting 

 50 pounds. The arm is intended for picking up selected 

 samples from the sea floor. It is mounted beneath the 

 forward shot tub where the operator of the craft can easily 

 see it through the forward observation window. The con- 

 trol box for the arm is in the sphere and consists of a 



Mechanical arm stowed under forwarc 

 ball ast tub 



23 



