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 volt-gap characteristics of two different aero plugs at room temperature.
| Identifier | ExFiles\Box 58\2\ Scan329 | |
| Date | 30th April 1936 | |
| SWINDON ELECTRICAL AREA VOLT - GAP CHARACTERISTICS OF AERO PLUGS AT ROOM TEMPERATURE VOLTS (PEAK) 12,000 10,000 8,000 6,000 4,000 2,000 GAP (INS) 0 .005 .010 .015 .020 .025 .030 K.L.G. V14/B K.L.G. 868D. R.H.S 30.4.36 | ||