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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).
Experimental dynamo tests, engine back-firing, and brush holder performance.

Identifier  ExFiles\Box 62\3\  scan0146
Date  24th August 1927 guessed
  
ROLLS-ROYCE LTD.
INSTRUCTIONS

To

Order No. P.D.58.
Customer's No. (6)

test on an experimental car; observing the peak output of the dynamo, and again observing it after we had deliberately caused the engine to back-fire. There was no appreciable difference.
While agreeing that there may be a temporary effect, it seems most unlikely that a few revolutions in a backward direction, can upset, for any great length of time, a bedding that has be obtained through long periods of continuous running in a forward direction. In support of this are the results of our experiments with one side of a holder removed, which showed that when running, the brush was dragged up to the trailing wall of the holder. (See PD 53)
A possible disadvantage of the narrow control brush is that it is lighter, and it was partly with a view to eliminating any possibility of an alteration in bedding due to extraneous forces, such as end-covers pressing on pigtail connections, and back-firing, that the tests with the increased bevel and special spring were initiated. (See PD 53)
Intermittent charge and cessation of charge

Signed

Cont'd

This Sheet must be filed on completion of the work.
  
  


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