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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).
Requesting an order for two 1 K.V.A. transformers for insulation testing based on received quotations.

Identifier  ExFiles\Box 24\2\  Scan070
Date  1st December 1920
  
X1109

To Hy.{Tom Haldenby - Plant Engineer} from EFC.

EFC2/T1.12.20.

X.1591. TRANSFORMER FOR INSULATION TESTING. X.11091

We attach a table of the various quotations which have been given in connection with the two transformers required, one for the Expl. Dept. and one for the Production Dept. for the purpose of insulation testing. We think that the most suitable transformer is the 1 K.V.A. quoted by Messrs. Mitchell, as this is provided with tappings for four different secondary voltages, which will be very convenient.

Perhaps you will now kindly arrange to have two of these transformers ordered for this purpose.

EFC.
  
  


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