Rolls-Royce Archives
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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).
Instructions on how to eliminate or minimize a singing noise from the dynamo.

Identifier  ExFiles\Box 36\4\  scan 145
Date  24th January 1919
  
R.R 300 (120B) (SF 349 24-1-19) MP 200552
ROLLS-ROYCE LIMITED.
INSTRUCTIONS.
II
91418
To
Order No.
Customer's No. 1.C.92
Re
speed before the singing is produced.
The singing may be entirely removed by lifting the control brushes either with the dynamo open circuited or charging.
Retarding the control brush to its full limit also has the effect of practically removing all the singing.
The singing may be minimised by a reasonable retarding of
(Cont-d.{John DeLooze - Company Secretary})
Signed
This Sheet must be filed on completion of the work.
  
  


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