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).
Extract from a report on ignition system leakage and spark gap performance.
| Identifier | ExFiles\Box 37\1\ scan 114 | |
| Date | 14th November 1921 guessed | |
| -2- Extract from a further report. The maximum regulat spark gap obtainable with a leakage of about 1.0 megohm across it was in all cases 2.0 mm. Using the terminals of the slate slab employed for the leakage test, an equally good spark (6.5 mm) could be obtained with .30 mf. as with .20 mf. on hhe distributor. RJA. | ||