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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 regarding the best type of piston rings to use.

Identifier  ExFiles\Box 16\1\  Scan130
Date  5th October 1915
  
R.R. 235a (200 H) (S.A. 442. 31-3-15) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 1001.
[Faded watermark text: DICKINSON & CO MADE AT CROXLEY]

[Typed text snippet:]
I shall also be glad of Mr Platford's and Mr Hives' confirmation as to which are the best piston rings we have made so far, whether it is the parallel, eccentric, semi-eccentric (which I should think would be good) hammered type, or the type made by ourselves.

[Handwritten text:]
RM{William Robotham - Chief Engineer}41
Letter from R-R of 5.10.15
re A94BX
  
  


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