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 table for a push button switch showing various gap measurements and button depression values.

Identifier  ExFiles\Box 34\3\  Scan030
Date  2nd August 1919
  
R.R. 226A (100 T) S.H. 798. 10-18-20. G 2247
X 2641
2.8.19.
X.1627. PUSH BUTTON SWITCH. X.2641.
Position. Carbon. gap. Copper gap. Button depression.
Off .040±15 .060±20 0
Carbons just in contact. 0 .033±10 .020±7
Coppers just in contact. 0 0 .045±15 (total)
EFC.
  
  


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