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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).
Changing the finish on a battery ignition contact breaker's fixed point screw from black oxidised to electro-tinned to improve electrical reliability.

Identifier  ExFiles\Box 32\5\  Scan079
Date  22th September 1928
  
x7690
To BY.{R.W. Bailey - Chief Engineer} from EFC.
c. BY/RD.
EFC3/T22.9.28.

BATTERY IGNITION CONTACT BREAKER
FIXED POINT SCREW SUPPORT ANDLOCK NUT

We notice that the threads and lock nut of the fixed contact point are black oxidised, whereas we think these should be electro-tinned.

The point we have in mind is reliability of the electrical connection between the fixed contact point supporting arm and the stud, which itself carries the point. Though we have not actually come across a certain case of this, it is possible that there may be a bad electrical connection here, and we had one case which we suspected may have been due to that cause.

EFC.
  
  


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