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).
Specifications for two different clutch drive springs.

Identifier  ExFiles\Box 169\4\  img235
Date  5th January 1933 guessed
  
Hs{Lord Ernest Hives - Chair} 799

DIA OF WIRE .072
MEAN DIA OF HELIX .350
10 WORKING COILS WITH 3/4 COIL (GROUND)
SQUARE EACH END) - SEMI OPEN ENDS)
FREE LENGTH 1.350 + .25
LOAD AT 1.100 = 24 LBS (APPROX)
SPRING - CLUTCH DRIVE PER II

RR CN.{Mr Chamberain} 299
12 OFF

Hs{Lord Ernest Hives - Chair} 800

DIA OF WIRE .064
MEAN DIA OF HELIX .320
13 WORKING COILS WITH 3/4 COIL GROUND)
SQUARE EACH END) - SEMI OPEN ENDS)
FREE LENGTH 1.350 + .25
LOAD AT 1.100 = 15 1/2 LBS (APPROX)
SPRING CLUTCH DRIVE PER II

RR P.H. 299
12 OFF
  
  


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