238 THE BATHYSPHERE OF 1 9 34 



the outer flange tightened as much as possible, the plugs 

 in the top and bottom of the window projection were re- 

 moved. A pressure gun was then inserted into the top open- 

 ing of one window and white lead forced into the space 

 surrounding the window until it came out of the bottom 

 hole. The bottom plug was then screwed in and tightened, 

 and additional force exerted on the pressure gun until the 

 entire space around the lens was filled with white lead. 

 The upper plug was then put in place and tightened. The 

 movement of the white lead is facilitated by the fact that 

 there is a small groove in the steel turret running around 

 the circumference of the lens. 



Stuffing-Box: No changes have been made in the stuff- 

 ing-box or in the glands through which the communica- 

 tion cable enters the bathysphere. Four or five layers of 

 ^ inch square, flax, oil packing are used between the 

 outer steel gland and the inner brass one, this making an 

 absolutely effective joint. Although the cable was taped 

 above the stuflSng-box so that if it did slip through the 

 packing it would be stopped at the tape, no motion was 

 observed beyond one-third of an inch slip on the deepest 

 dive. 



In running the cable through the glands and in tighten- 

 ing the stufl&ng-box, it was found that the use of ice to 

 lower the temperature of the metal was an easy method of 

 making a tight joint. This also approached the condition 

 surrounding the bathysphere when it was below in water 



