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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).
Extract from a report on the dynamo performance on vehicle 18-GIV at 6,000 miles.

Identifier  ExFiles\Box 62\3\  scan0079
Date  18th December 1930
  
X.6005.

18.12.30.

Extract from report on 18-GIV at 6,000 miles.

DYNAMO
High output 48 coib armature, suitable for half charge scheme.

The dynamo has been sufficient for night driving of approx. 4 hours each run. There has been no failure of the lights. The dynamo cuts in at 17 mph. Its maximum charge during the day is 6 amps. With all lights, windscreen wiper, facier lights, there is a nominal charge of .5 of an ampere to 35 mph. At 40 m.p.h. there is a discharge of .1 ampere. At 60 m.p.h. 2 amperes. There has been an audible brush noise that could be complained of from the control brush.
  
  


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