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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).
Speedometer reading 6% slow on a trials car (46-PK) due to temperature error, recommending a duralumin cup.

Identifier  ExFiles\Box 29\3\  Scan158
Date  6th September 1927
  
To Hm.{Capt. W. Hallam - Head Repairs}
To BY.{R.W. Bailey - Chief Engineer} } FROM Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
4788
Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}4/LG6.9.27.
c. to EP.{G. Eric Platford - Chief Quality Engineer} Mx.{John H Maddocks - Chief Proving Officer} Roy.{Sir Henry Royce} C.

A.T. SPEEDOMETER. X4308

In our recent test of a trials car (46-PK) on Brooklands, we observed that the speedometer was reading about 6% slow.

We consider that this was due to the temperature error of the instrument as explained in our Hs{Lord Ernest Hives - Chair}/RmL/LG13.7.27.

We recommend that all speedometers fitted to trials cars should be equipped with the latest type of duralumin cup which obviates this error.

Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
  
  


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