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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).
Test of the co-efficient of friction with variable temperatures against a steel wheel.

Identifier  ExFiles\Box 141\3\  scan0151
Date  14th February 1933 guessed
  
TEST OF CO-EFFICIENT OF FRICTION WITH
VARIABLE TEMPERATURES AGAINST A STEEL WHEEL.

Temperature Spring Balance* Balance Wt. Co-efficient of Friction.

140°C - 284°F 75 70 .466
150 C - 302 F 75 70 .466
160 C - 320 F 75 69 .460
170 C - 338 F 75 69 .460
180 C - 356 F 75 68 .453
190 C - 374 F 75 68 .453
200 C - 392 F 75 67 .446
210 C - 410 F 75 67 .446
220 C - 428 F 75 67 .446
230 C - 446 F 75 68 .453
240 C - 464 F 75 67 .446
250 C - 482 F 75 67 .446
260 C - 500 F 75 67 .446
270 C - 518 F 75 68 .453
280 C - 536 F 75 68 .453
290 C - 554 F 75 67 .446
300 C - 572 F 75 69 .460
310 C - 590 F . 75 70 .466

Note - *S.B. 75 is equivalent to 33.3 lbs. per sq. inch of Rubbing surface.
Surface speed approx. constant at 4600 ft./min.

A recent test on "GANOLD" Lining showed a loss in thickness of .077" after 9 hours running.

The work done during this time was 130,000,000 ft./lbs. Thus to wear down 1/8" this Lining would dissipate 211,000,000 ft./lbs. of work.
  
  


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