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).
Investigation into a hum by adjusting the control brush on a bench and a rig.

Identifier  ExFiles\Box 36\4\  scan 107
Date  30th July 1920
  
Contd.
-2-
EFC4/T30.7.20.

to see whether the movement of the control brush will cause the hum to disappear at that particular speed. On the bemch, although we find the hum to be a little later, we find that it still occurs to some extent, but as we have already pointed out what happens to the hum on the bench is little indication of what would happen on the rig.

EFC.
  
  


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