less tJian /ooo faUioiiis 



f/v/n /ooo to -jooo fathoms. 

 ,, 'JO 00 ,, 5ooo 

 5ooo ,, 'J-ooo 

 /i'Lifthi. Diorc t/utn 4ooo 

 , ^ Banks . 





from 

 Nucleifi|?9wer§9'Ship^ 



6200/ 



\/l^\ ^ NATIONAL RESEARCH COUNCIL o 



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^■/ 



Publication 658 



