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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).
Letter to S. Smith & Sons Ltd. discussing the acceptable performance and accuracy for electrical clocks before batch testing.

Identifier  ExFiles\Box 164\1\  img239
Date  3rd July 1940
  
Rm.{William Robotham - Chief Engineer}S/ML.

3.7.40.

C.W.Nicholls,Esq.,
Messrs S.Smith & Sons Ltd.,
Cricklewood Works,
Edgware Road,
London.N.W.2.

Dear Mr. Nicholls,

Thank you for your letter of July 1st. re electrical clocks.

I am prepared to run a batch of six clocks on one of our Experimental cars to get a mean figure of merit for the instruments, but before so doing I would like to have from you a figure of merit as to how you expect these clocks to behave. In other words, if these instruments are going to gain or lose 5 minutes per week on an average, I should still expect to get severe criticism from our customers, mainly because the error would be cumulative.

Yours sincerely,
  
  


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