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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 from S. Smith & Sons discussing the accuracy of an instrument, comparing an electric design to a stem-wind job.

Identifier  ExFiles\Box 164\1\  img237
Date  24th June 1940
  
S. SMITH & SONS (MOTOR ACCESSORIES) LTD. CONTINUATION SHEET. 1.

article and that we can give you one which will not have a greater variation than five minutes per week under normal running conditions. If you require greater accuracy it is not possible in any electric design and the alternative is a really high class stem-wind job. Such a move, in my humble opinion, would be a retrograde step.

If you would like further samples for test I shall be delighted to take care of them if you will let me know your wishes.

Sincerely yours,

Charles W. March

W.A.Robotham, Esq.,
24.6.40
  
  


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