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 of leakage versus temperature during heating and cooling cycles for a plug after a 650-mile run.
| Identifier | ExFiles\Box 150\1\ scan0193 | |
| Date | 29th August 1936 guessed | |
| 2 KLG 850 A HEATING COOLING PLUG RUN FOR 650 MILES IN B-23-AE LEAKAGE (MEGOHMS) TEMP °C | ||