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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).
Page 2 of an experimental report discussing clutch lining wear, testing methods, and friction coefficients.

Identifier  ExFiles\Box 26\4\  Scan228
Date  17th January 1924
  
R.R. 493A (40 H) (SL 42 12-7-23). J.H. D.{John DeLooze - Company Secretary}
-2-
EXPERIMENTAL REPORT.
Expl. No.
REF: hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}/LG17.1.24.
dust on the surface caused by wear, being unable to get away.
They did not demonstrate this to us, and it would appear to
be worth proving as otherwise they can always argue that this
is the case.
(5) We obtained a sketch of the method that they have
for testing clutch lining of the disc type.
(6) The co-efficient of friction of Ferodo against a
cast iron surface is 5% higher then against a similar steel
face from their tests.
HS{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
  
  


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