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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).
From 'R' to 'Wor.' for 'E.H.' discussing three potential modifications to a low-speed jet.

Identifier  ExFiles\Box 31\3\  Scan026
Date  15th February 1915 guessed
  
To Wor.{Arthur Wormald - General Works Manager} for EH. from R.{Sir Henry Royce}

COPY

R2/IB6215.

of the low speed jet by making a double thread of the same pitch as the high speed jet, but of course it will have to be right handed. You might, however, as a temporary expedient, alter the angle of the cone belonging to the low speed jet so as to make it about twice as rapid. If we do not adopt this arrangement, we might adapt the lever so as to lift this spindle when starting the engine, as suggested by Mr Ionides. Find out which of the three you prefer.

R.{Sir Henry Royce}

[Watermark: DICKINSON BOND 1807]
  
  


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