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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).
The mandatory Brinell hardness testing of steering levers to ensure correct heat treatment.

Identifier  ExFiles\Box 38\1\  Scan049
Date  6th September 1919
  
H.R. 735 & 208 T) (S.F. 674. 22-8-19) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2376
X3465
Mr Insull from BY.{R.W. Bailey - Chief Engineer}
Mr Pendlebury.
c. HBO.
c. EH.
c. Bn.{W.O. Bentley / Mr Barrington}
BY3/P6.9.19.
RE STEERING LEVERS.
--------
It is most important that each lever must have a brinell test taken and that the impression should be taken in a place where it will not be machined off.
EH. points out that the rocking lever which broke on bumper was soft mild steel and only gave a brinell reading of 197. Care must be taken that this cannot happen on chassis.
If HBO. will consult Btn or myself we will fix a position where we shall specify on the drawing that Brinell must be taken and impression left by Mr Pendlebury so that Mr Insull may check readings to ensure the metal parts being properly heat treated.
BY.{R.W. Bailey - Chief Engineer}
  
  


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