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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).
The Spectre carburetter filter, referencing drawing LeC.4594 and modifications similar to the 20/25 engine.

Identifier  ExFiles\Box 93\2\  scan0067
Date  6th July 1935
  
To BY.{R.W. Bailey - Chief Engineer}
Copy to Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} RHO
+308
Bowering - Follow up please
SPECTRECodename for Phantom III CARBURETTER FILTER. Rm{William Robotham - Chief Engineer} JvG
We send you herewith LeC.4594 of a carburetter filter for the above engine, on the same lines as that which has already been instructed for the 20/25.
It should be noted that this scheme calls for a slight modification to the tappet cover and a shorter flexible petrol pipe.
E/PSN.
Drawing Retained
Hk{Col. T. Harker - Sales}/Powa.
Att: LeC.4594.
  
  


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