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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).
Two Bentley dynamo failures due to the continual blacking up of the commutators.

Identifier  ExFiles\Box 162\1\  img069
Date  17th June 1937
  
To Rm{William Robotham - Chief Engineer}/Wst. from Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux}
c. By.{R.W. Bailey - Chief Engineer}
c. Rm.{William Robotham - Chief Engineer}
S W H
Kingsbury
June 17th.1937
BENTLEY DYNAMO FAILURE.
Two dynamos are being returned to the Works today for continual blacking up of the commutators. In both cases the breather is fitted to the tachometer drive.
(1) Chassis B.121.H.M. Mileage 8,453.
Dynamo No.E.7.B.F.
(2) Chassis B.122.J.D. Mileage 3,658.
Dynamo No.S.8.B.R.
These are being sent under order No. S.R.4321.
Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux}
  
  


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