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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 a spring behind a carrier plate on a 20-EX model.

Identifier  ExFiles\Box 13\7\  07-page043
Date  11th March 1930 guessed
  
HS{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
K7480

G.73710. Spring behind carrier
plate on 20-EX.

Dia. of Wire. .092
Free Length. 1.100
Outside Dia. .487"
Working Coils. 5 1/2
End Coils 2

69 lbs to compress to .850".

Stress 15,400 O.K. Rm{William Robotham - Chief Engineer}
  
  


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