Rolls-Royce Archives
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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).
Returning Heath spark plugs after testing revealed them to be the worst performing.

Identifier  ExFiles\Box 33\3\  Scan097
Date  13th January 1921
  
To EP{G. Eric Platford - Chief Quality Engineer}+ from hs{Lord Ernest Hives - Chair}/TMW.
W.
X.1812a.
Hs{Lord Ernest Hives - Chair}/TMW1/LG13.1.21.
RE. HEATH SPARK PLUGS.
You will remember you sent 6 of the above plugs for us to test and report. We have put them in an engine and tested them in comparison with several other makes of plugs. We find they are quite the worst of the bunch, we, therefore, return them herewith.
Hs{Lord Ernest Hives - Chair}/TMW.
  
  


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