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 plotting leakage versus temperature for a KLG 850 A plug during heating and cooling cycles after a 650-mile run.
| Identifier | ExFiles\Box 150\1\ scan0194 | |
| Date | 29th August 1936 | |
| 3 KLG 850 A LEAKAGE (MEGOHMS) HEATING ---- COOLING -- -- PLUG RUN FOR 650 MILES IN B.23+AE TEMPRE °C. 29.8.36 | ||