Fig. 84. (upper) The heavy brass nuts are screwed into place, each one numbered and 

 fitted to its particular bolt. Fig. 85. {lower) The central wing-bolt has been screwed tight 

 and now a sledge hammer is being used, until the wing-bolt and all ten nuts seem as if they 

 were a single piece with the whole welded body of the bathysphere. The noise is terrific on 

 our eardrums as we sit curled up inside. 



