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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).
Condition of a Voke's air filter and the difficulty in obtaining a choked one for testing.

Identifier  ExFiles\Box 131\4\  scan0027
Date  1st February 1937
  
X113
Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} from Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux}
Kingsbury,
1st February, 1937.

Air Cleaners.

With reference to your memo Rm{William Robotham - Chief Engineer}10/R.25.1.37, I have made enquiries here with regard to Bentley's I have just seen a Voke's filter which has been run 10,000 miles and it was practically as clean as the day fitted.

I am endeavouring to obtain a dirty one from an old car but Kingsbury state they have not come across one which has been choked. They have made a practice of blowing out the filter on all the carbs. and state it will be impossible to get hold of one, without a Car comes in that has not been to the Depot previously.

Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux}
  
  


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