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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).
Modification of a battery charge controller to suit a 6-volt American system.

Identifier  ExFiles\Box 59\1\  Scan273
Date  18th February 1928
  
X 4008
BY/RD2/ML18.2.28.
RECEIVED FEB 18 1928

BATTERY CHARGE CONTROLLER.

We have an order to supply R.R. of America Inc. with one Battery Charge Controller Unit, Yellow Sheet Y.35357, O/26436.

Will you please put in hand one Controller Unit to L.O.P. D.71499, but as the American system is 6 volts it will be necessary to have suitable windings, therefore we send herewith blueprint of D.71533 shewing these windings.

The two items on the L.O.P. D.71499 not required owing to this special winding are :-

12 ft. 30 S.W.G. Eureka Resistance Wire.
500 " 36 " Copper Wire.

The wire we shall need is:-

8 1/2 ft. 26 S.W.G. D.C.C. Eureka Resistance Wire.
256 " 32 S.W.G. D.S.C. Copper Wire.

Will you please put this in hand and let EFC. have same for test and D/BP. make the necessary arrangements for despatch when it is complete.

BY/RD
  
  


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