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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 utility of a thermometer for preventing radiator freezing compared to fitting a thermostat.

Identifier  ExFiles\Box 149a\3\  scan0023
Date  19th July 1920
  
Contd. -2- Hs{Lord Ernest Hives - Chair}5/LG19.7.20.

precautions against the radiator freezing up in winter. If a
driver sees on his instrument board the water temperature shown
as 80°C, he may not realise that under certain conditions the
radiator might still freeze although the water shown by the
Thermometer was at 80°C. We suggest that if he has no
Thermometer he will, when the weather is exceptionally cold,
take the ordinary precautions to prevent the water freezing.
The only time we can see that the Thermometer would be useful is
when the radiator is blanked up in Winter: it would show then when
the radiator was blanked up too much so that it caused the water
to boil. We doubt whether it is worth while carrying a Ther-
mometer the whole of the time on the car for that reason. If the
water boils it soon becomes obvious to the driver. The blank-
etting of the radiator would then be adjusted to suit the condition
It may be of course be that we do not appreciate the American
conditions but we do not consider that Mr. Olley has put forward
a very strong case for retaining the Thermometer when a
Thermostat is fitted.


Hs{Lord Ernest Hives - Chair},



R.R. 285A (100) (T.S.G. 648. 19-2-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2818
  
  


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