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).
Graph comparing critical atmospheric temperature for spring-tensioned versus positively tensioned fan belts at 62 MPH.

Identifier  ExFiles\Box 14\7\  Scan023
Date  2nd July 1930 guessed
  
GRAPH V.{VIENNA}
19 E.X. 62 M.P.H.
NO BONNET VENTILATION
COMPARISON OF SPRING TENSIONED FAN AND FAN BELT TENSIONED POSITIVELY.
CRITICAL ATS TEMP
10°C
20°C
30°C
40°C
SPRING TENSIONED
40.5
BELT TIGHTENED Choc à Bloc
44.5
  
  


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