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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).
Page discussing the causes of knock in the transmission, specifically uneven engine firing, and proposing solutions.

Identifier  ExFiles\Box 54\3\  Scan017
Date  8th June 1921
  
R.R. 235a (100 T) (S.H. 798, 11-12-20) G. {Mr Griffiths - Chief Accountant / Mr Gnapp} 2048
Contd.
-2-
R10/G8.6.21.

We think all future cars should be fitted
with one of these devices.

The other cause of knock in the transmission is
due to the uneven firing of the engine. I am suggesting
under various headings, the ways and means of reducing
the tendency for this to happen.
  
  


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