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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).
Three schemes for an automatic carburetter control using different diameter bellows.

Identifier  ExFiles\Box 102\1\  scan0174
Date  18th May 1934
  
Rm{William Robotham - Chief Engineer}

To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} from E/PSN.
E/PSN.2/HP.18.5.34.

c. By.{R.W. Bailey - Chief Engineer} RHC.{R. H. Coverley - Production Engineer}

re Automatic Carburetter Control.

We send you herewith a print of LeC.3934 showing 1½" diameter bellows fitted to the automatic starting and warming up control for horizontal carburetters.

There are now three schemes with ¾", 1" and 1½" diameters bellows respectively.

This latest scheme which has been made at the suggestion of Messrs. Thermoflex, the makers of the bellows, utilises a very flexible large diameter bellows in conjunction with a spring and does not rely on the spring rate of the bellows.to control the movement.

There is no doubt that this scheme is much better from their point of view as compensation for manufacturing variations in the flexibility of the bellows can easily be made by the spring but it does make the whole control much larger, which is very undesirable.

We therefore suggest that all three schemes should be made up and tried and if one of the smaller diameter units cannot be made to work satisfactorily then every effort should be made to reduce the diameter of the bellows on the larger spring controlled unit.

Print to Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
RHC.{R. H. Coverley - Production Engineer}
E/PSN.
  
  


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