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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).
Replacing a Bijur dynamo on a Packard car and specifying its electrical output for a 20 HP car.

Identifier  ExFiles\Box 38\3\  Scan129
Date  6th February 1919
  
H.R. 235a (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13.

X.3362.

R6/G6.2.19.

To EH. from R.{Sir Henry Royce}
c. to EFC.

X.3231.-BIJUR DYNAMO. X.3631. X 3362 X3762 X435

With reference to the Bijur dynamo, I am quite in agreement with you sending the one from 49GB to replace the one which is here belonging to the Packard car. It should be ready to fit the same bracket, as the plant is in daily use for the office.

X3033

Mr. Clark may be coming next week and might bring this together with other electrical parts which will serve for models to guide some calculations. We are allowing for 60 watts as the output for the 20 HP. car dynamo i.e. 12 v.{VIENNA} 5 amps., cutting at 8 to 900 revs = 600 engine revs.
Will this be about right for a small limousine?

R.{Sir Henry Royce}
  
  


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