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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).
Change in the casing thickness for the 3/19 gearbox.

Identifier  ExFiles\Box 137\5\  scan0016
Date  19th November 1919
  
To DA.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer}
Copy to CJ.
" " BN.{W.O. Bentley / Mr Barrington}
" " EH.
" " EFC.

RE 3/19 GEAR BOX.

E4/G19.11.19.

X.3720.

Referring to the thickness of the casing of the 3/19 gear box, I think this is generally shewn on the three schemes sent to you of this box as .250".

Would you kindly note that we should make this dimension .200". The casting will come out naturally thicker thanthis by the amount added by the operations of the foundry.

E.{Mr Elliott - Chief Engineer}
  
  


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