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).
Page 3 of a document discussing an experiment to reduce gear noise with helical teeth.

Identifier  ExFiles\Box 64\3\  scan0130
Date  8th December 1927 guessed
  
-3- Contd.

use of parallel teeth, the other set to be helical with the present helix but to have more suitably cut teeth as an experiment on the reduction of gear noise with the present arrangement.

EFC.
  
  


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