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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).
Enquiry to A.T. Speedometer Co. about a suitable electrical tachometer of the generator-cum-vacuum type.

Identifier  ExFiles\Box 163\4\  img096
Date  7th February 1941
  
Elec
6010
Em/RC.{R. Childs}3/MT.
7th February, 1941.

A.T. SPEEDOMETER Co., Ltd.,
Chronos Works,
North Circular Road,
LONDON N.W. 2.

For the attention
of Mr. Arrowsmith.

Dear Sirs,

We shall require, in the near future, an electrical tacho-meter of the generator-cum-vacuum type. The instrument will run at about 1100 r.p.m.

We would be glad to receive any particulars of a suitable instrument which you have or know about.

Yours faithfully,
  
  


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