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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).
Requesting a modification to the water temperature regulator on the 40/50 HP chassis to aid in draining.

Identifier  WestWitteringFiles\D\February1920\  Scan29
Date  1st February 1920
  
To BA. from E.{Mr Elliott - Chief Engineer}
Copy to CJ. [struck through]
" " BN.{W.O. Bentley / Mr Barrington} [struck through]
" " HS.{Lord Ernest Hives - Chair} [struck through]
" " CK.{Mr Clark} X.3563

ORIGINAL.

E1/G5/2/20. 3

RE WATER TEMPERATURE REGULATOR.
40/50 H.P. CHASSIS.

When it is desired to drain a car fitted with the
water temperature regulator, unless the valve seat of the top
regulator valve is poor, the water should be held up owing to
the lock formed by the valve.

Would you kindly arrange to have a smaller hole drilled
through the valve disc to form an air leak and to enable the
water to drain away without fail.

E.{Mr Elliott - Chief Engineer}
  
  


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