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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).
Gap table for a main and auxiliary switch unit.

Identifier  ExFiles\Box 64\4\  scan0190
Date  27th February 1929
  
MAIN AND AUXILIARY SWITCH UNIT
UNIT:_____
GAP TABLES.
As instructed by EFC.

MAIN SWITCH :

Position of switch.
Air gap at core centre.
Core to armature stop.
Copper gap (of last contact to make.)
Carbon gap.

Off.
.080
.084
.075
.040

Carbons just in contact.
.059
.059
.040
0

Auxiliary switch carbons just in contact.
.037
.033
0
0

Coppers just on contact.
.035
.030
0
0

Full on.
.010
0
0
0

AUXILIARY SWITCH:

Position.
Air gap at core.
Gap between pole core & arm: stop.
Gap at upper contact.
Gap at lower contact.
Gap at carbon contacts.

Off.
.065
.065
0
.030
0

Carbons just breaking. Just making on lower contact.
.047
.044
.025
0
0

Full on.
.010
0
.077
0
.071

EFC.
  
  


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