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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).
Quoting Hancock's report regarding a chart showing water and air temperature variations during a 250-mile run.

Identifier  ExFiles\Box 11\3\  03-page253
Date  23th July 1930
  
x7941d
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E.{Mr Elliott - Chief Engineer} From Hs.{Lord Ernest Hives - Chair}
C. to Sz. Nor.
C. to E.{Mr Elliott - Chief Engineer} Ds.
C. to Sy.

Hs.{Lord Ernest Hives - Chair}A/AL.23.7.30.

24-KL.

The following paragraph is contained in Hancock's report of 20.7.30. -

Re. Temperatures varying with speed and air temperatures.

"We are sending you a chart showing the various rises and falls of water and air temperatures during the car's mileage for 4 days. The readings are taken every 50 miles, irrespective of speed. The speed of the car is just as the traffic etc., allows. The curves therefore show what actually happens during a 250 mile run". WEL.

Hs.{Lord Ernest Hives - Chair}

Copy of chart attached.
  
  


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