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).
Note explaining why pull and speed curves are shown in narrow bands representing layers of cable.

Identifier  ExFiles\Box 175\2\  img136
Date  31th May 1940 guessed
  
-4-

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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