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 in megohms versus temperature in degrees Celsius for a cleaned KLG 850A plug during repeated heating and cooling tests.
| Identifier | ExFiles\Box 150\1\ scan0195 | |
| Date | 23th August 1938 | |
| ③ KLG 850A PLUG CLEANED & TEST REPEATED LEAKAGE (MEGOHMS.) TEMP RE °C HEATING COOLING 2000 1800 1600 1400 1200 1000 600 400 200 O 100 200 300 400 500 600 700 800 23. 8. 38 | ||