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).
Explanation for why pull and speed curves are depicted as narrow bands.

Identifier  ExFiles\Box 175\2\  img126
Date  5th June 1941 guessed
  
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The reason for shewing the pull and speed curves as narrow bands is that actually they would go up in a series of steps, one step for each layer of cable, and as the step from one layer to the next would be of indeterminate shape a band is shewn covering the extremes of the steps.
  
  


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