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).
Graph showing the relationship between temperature and effective insulation resistance for a Champion R-11-V sparking plug.
| Identifier | ExFiles\Box 35\4\ scan 012 | |
| Date | 19th March 1928 | |
| DRG.Nº E.E.1670. ISSUED BY: Directorate of Technical Development. AIR MINISTRY DEPT. ELECTRICAL DRAWN S.D.A TRACED L.E.B. 19.3.28 CHECKED HtH APPROVED GRB 19.3.28 S.P.402. FIG.3. CURVE SHOWING INCREASE OF EFFECTIVE RESISTANCE WITH TEMPERATURE RISE. CHAMPION SPARKING PLUG. TYPE R-11-V.{VIENNA} Ex FALCON XI ENGINE. E.E.1670. EFFECTIVE INSULATION RESISTANCE (MEGOHMS) TEMPERATURE t°C. PLUG Nº.2. NOTE:- EFFECTIVE RESISTANCE AFTER COOLING DOWN TO ATMOS TEMP. WAS GREATER THAN 2.0 MEGOHMS. | ||