THE BATHYSPHERE OF 1 9 34 237 



in the groove of the door frame has been replaced by a new 

 one. The same is true of the smaller copper washer on the 

 door itself, into which the flange of the wing-bolt fits. 

 These two washers are subjected to tremendous pressure, 

 not only by the strain of combating the pressure of the 

 deep, but also by the force exerted when the bolts and the 

 wing-bolt are finally tightened by hammering. The orig- 

 inal washers had crystallized to such an extent that they 

 were worthless. 



The brass wing-bolt that screws into the center of the 

 door is also new, the old one having been damaged in 1932 

 when it was hurled across the deck after an implosion of 

 water. 



Windows: Two new quartz windows, 3 inches thick, 

 8 inches in diameter ( 6 inches of which is free of the sup- 

 porting flange) , were necessary this year as peculiar smoky 

 patches had developed in the old, and in attempting to re- 

 move them from their frames they had cracked. Heavier 

 steel flanges were built to hold the windows in place and 

 these fn turn are fastened by stronger studs and nuts than 

 those used before. The left hand window frame is still 

 sealed with a steel plug. An additional small hole, fitted 

 with a screw plug, has been drilled on the lower side of each 

 window turret in order, as will be explained, to make the 

 window sealing more effective. 



Thus when the new windows were inserted into their 

 frames with heavy paper washers at front and back, and 



