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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).
The successful testing of steel clutch rings, leading to their approval for standard use.

Identifier  ExFiles\Box 20\3\  Scan035
Date  21th August 1912
  
Mr Royce 21.8.12.

Cone Clutch. (tests of steel clutch rings).

TBB3/L21812.

X357

Mr Platford reports that one of these clutch rings has run for 2500 miles, including a considerable amount of hill climbing. A number of other steel clutch rings have also been tested on experimental cars and they have all given every satisfaction.

In consequence of this report I have confirmed to the Order Office the use of these steel clutch rings for standard.

You will remember that we decided to test some clutch rings made from steel in order to see if the cotton fabric behaved in any different manner, before actually fitting these rings to standard cars.
  
  


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