Rolls-Royce Archives
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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).
Comparing P+R Standard and Exide threaded rubber battery separators.

Identifier  ExFiles\Box 54\5\  Scan120
Date  19th July 1929 guessed
  
J.D.16. 2

P+R.{Sir Henry Royce} Standard.
Exide Threaded Rubber.
P+R Standard.

By this it seems that threaded rubber separators suit the P+R better than the Exide especially with the rib facing the positive plate. This has been the case throughout the life of the battery.

G.H.
  
  


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