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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).
Table for the gap adjustment specifications for a duplex push button switch.

Identifier  ExFiles\Box 64\4\  scan0308
Date  28th June 1929
  
X7655
28.6.29.
X.7656.
DUPLEX PUSH BUTTON SWITCH.
TABLE FOR GAP ADJUSTMENT.
Position    Button depression.    Copper gap.    Carbon gap.
Off    A + .000    .065 +12 -10    .025 +15
Carbons in contact.    A+.014+8    .045 -10    0
Coppers in contact.    A+.046 +8 -7    0    0

where A = initial button depression which should be .012"

In the above table the two quantities underlined are considered to be the "basic" gaps i.e. those which are set in the initial adjustment of the switch. The other gaps are dependent quantities and are given merely as a check on the adjustment of the switch.
EFC.
  
  


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