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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).
Letter and blueprint from Messrs. Cussons for the Dalby-Watson Optical Indicator on the Eagle engine.

Identifier  ExFiles\Box 79\3\  scan0079
Date  9th February 1918
  
R.R. 235B (200 T) (S.D. 408. 26-4-17.) Bm. 2/156/12.
To JS{Mr Johnson's Secretary}/Jn. from EFC.
EFC3/T9.2.18.
X3181 - DALBY-WATSON OPTICAL INDICATOR

Herewith please receive copy of a letter received from Messrs. Cussons, together with a blueprint they have forwarded to us, which shows details of the arrangement of their optical indicator on our Eagle engine. You will note that they say that the drawing of the indicator on the scheme we have already had is full size and the outside dimensions can be scaled from that.

We think the present print, together with previous one should give you all you require, but if this is still insufficient, we shall be pleased to write again to Messrs. Cussons for anything further.

EFC.
  
  


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