1913] on Recent Advances in Scientific Steel IVIetallurgy 609 



achieved in the art, and in effect (to use the words of Coleridge's 

 " Ancient Mariner ") the patentees claimed 



" We were the first that ever burst 

 Into that silent sea." 



EFFiciency Numbers 



00 



o 

 :i o 



r to 



3 O 



J o 



5 o 



S o 



Fig. 7. — Physical Curves obtained by Arnold and McWilliam 

 FOR Tungsten-Chrome Steels. 



2 S 2 



