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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).
Comparing the installation and performance of Harrison and Clayton car heaters.

Identifier  ExFiles\Box 137\1\  scan0328
Date  15th December 1937
  
-2-
RM{William Robotham - Chief Engineer}/Std.9/MH.{M. Huckerby}15.12.37.

We would point out that if the heater is recessed flush with its surroundings, it is just as important for provision to be made for a cool inlet air supply to the back of the fan before passing through the matrix, as for a hot air exit to be provided for the Clayton Heater.

Attached sketch indicates what is meant. The old type Harrison heater which you had fitted up in 36-EX had no such provision made and therefore had a negligible heating effect.

Summing up, there seems to be few advantages obtained by changing to the Harrison heater, while a number of disadvantages are apparent. The Harrison, however, is the best of a number of American heaters which we have tested.

RM{William Robotham - Chief Engineer}/Std.
  
  


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