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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).
Query on selectively hardening parts during the nitriding process, suggesting copper-plating as a method.

Identifier  ExFiles\Box 17\6\  Scan068
Date  22th November 1928
  
BY.{R.W. Bailey - Chief Engineer} from R.{Sir Henry Royce}
HS.{Lord Ernest Hives - Chair}

X7060

R1/M22.11.28.

NITRIFYING HARDENING. X.4469 X.7060 X.7090

In the above process can parts be treated so that they do not harden, say by copper-plating?

The valve gear cam followers must not be hardened on the thread.

R.{Sir Henry Royce}
  
  


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