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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Instruction specifying the heat treatment for crank forgings to a Brinell hardness of 241-269.

Identifier  ExFiles\Box 132\2\  scan0165
Date  5th April 1940
  
To HPS{Horace Percy Smith - Experimental Factory Mgr}
C. to HPS{Horace Percy Smith - Experimental Factory Mgr}/HH

M11b

Rm{William Robotham - Chief Engineer}/CTS{C. Trot Salt - Carburation}1/CK{Mr Clark} 5.4.40

Crankshafts

Will you please see that any further available crank forgings for chassis work are from henceforth heat treated to 241-269 Brinell.

Rm{William Robotham - Chief Engineer}/CTS{C. Trot Salt - Carburation}
  
  


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