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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).
Query regarding the use of bonnet shutters in India to assess whether to discontinue fitting them due to cost and rattling.

Identifier  ExFiles\Box 119\3\  scan0068
Date  21th September 1920
  
[Handwritten top center] X1085 S.F.C.
[Typed top right] Hs{Lord Ernest Hives - Chair}3/LG21.9.20.
To Mr. Kirby - India.
from Hs.{Lord Ernest Hives - Chair} [Handwritten below] bwt. kkinc.
[Handwritten] X.3499 RE - SHUTTERS IN BONNETS. [Handwritten] X.3456

The Experimental Department would like to know whether the Shutters which we fit in all our Bonnets are ever used in India. The Shutters were originally fitted in order to increase the efficiency of the radiator and reduce the temperature of the floor-boards. The effect of opening all four Shutters is that it will reduce the water temperature 5 to 6%. The Shutters were fitted at a time when we were using the old type crinkled tube radiator which was not as efficient as the present round tube radiator. If we can prove that the Shutters are hardly ever used by our customers, then we would recommend to Mr. Royce that we stopped fitting them because they are expensive pieces to fit and are frequently a source of rattles.

Hs.{Lord Ernest Hives - Chair}
  
  


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