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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).
Adding 10% paraffin to Shell Motor Spirit to match the distillation curve of American fuel.

Identifier  ExFiles\Box 20\6\  Scan049
Date  7th March 1921
  
X. 985

To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair}
c. to CJ.
c. to EF.

HSB/LG/7.3.21.

Re Petrol

We find that it is necessary to add 10% paraffin to the Shell Motor Spirit in order to get a similar Distillation Curve to that which is obtained with the American fuel
  
  


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