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. | ||