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).
Specification sheet detailing measurements and ratios for a Duplex Push Button Switch.

Identifier  ExFiles\Box 64\3\  scan0284
Date  15th July 1926
  
x 7630
15.7.26.

DUPLEX PUSH BUTTON SWITCH.

Fulcrum to button .825"
Fulcrum to copper contact. 1.187"
Fulcrum to carbon contact. 1.500"

Ratio copper contact arm
button arm = 1.439 θ

Ratio carbon contact arm
button arm = 1.818 ∅

Ratio carbon contact arm
copper contact arm = 1.264 ψ

EFC/HEW.
  
  


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