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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).
Comparison of the coefficient of friction over a 10-minute period for 'Mintex' flexible brake lining versus Cast Iron on Cast Iron.

Identifier  ExFiles\Box 26\4\  Scan281
Date  21th January 1926 guessed
  
Handwritten Top: X719, K3409 (crossed out)
Handwritten Right: 61802, 61803

Top Graph:
CO-EFFICIENT OF FRICTION
"MINTEX" FLEXIBLE BRAKE LINING
(WOVEN ASBESTOS & BRASS WIRE)
AVERAGE CO-EFFICIENT OF FRICTION = 0.326
Y-Axis: 0.4, 0.3, 0.2, 0
X-Axis: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 MINUTES

Bottom Graph:
CO-EFFICIENT OF FRICTION
CAST IRON ON CAST IRON
AVERAGE CO-EFFICIENT OF FRICTION = 0.216
Y-Axis: 0.4, 0.3, 0.2, 0.1, 0
X-Axis: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 MINUTES
  
  


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