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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).
Change in material and force requirements for springs in a battery ignition contact breaker.

Identifier  ExFiles\Box 32\5\  Scan048
Date  23th December 1926
  
To RHC.{R. H. Coverley - Production Engineer} from EFC.
X6096
EFC1/T23.12.26.

SPECIAL SPRINGS FOR BATTERY IGNITION
CONTACT BREAKER TO GIVE BIGGER
PRESSURE ON POINTS.

-- -- --

To make matters clear as to what is actually
required in this connection, we require the springs
to be made of 23 SWG. gauge material in place of the
24 SWG. as at present.

We require the natural shape of the spring to be
such that it requires a 30% greater force, i.e. a force
of 2.75 lbs. to compress the spring to the shape given
by the drawing, instead of the 2.125 lbs. as given on
the drawing for the 24 gauge material.

EFC.
  
  


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