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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).
Instructions for continuing the testing of insulation materials like steatite and porcelain for sparking plugs.

Identifier  ExFiles\Box 24\2\  Scan054
Date  24th January 1919
  
RR 300 (120B) (SF 349 24-1-19) MP 200552
88230
ROLLS-ROYCE LIMITED.
INSTRUCTIONS.
To
Order No
Customer's No. 19
Re Insulation Testing (cont'd)
occurs. Note this temperature. Also observe any distortion.
e) Steatite, porcelain &c
1) For use in sparking plugs, break a sample and note fracture, whether rough like earthenware or smooth like glass.
2) Heat on plate over gas-ring and note whether it cracks.
3) Observe whether inherently non-hygroscopic, or dependent on glage.
4) Make up into plugs and test on aero-engine. Note pre-ignitions, absence from sooting & cracking &c.
Signed Taniers J Allen.
This Sheet must be filed on completion of the work.
  
  


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