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).
Comparative sparking test between a Watford E.6 Magneto and a standard battery ignition system on a utility test.
| Identifier | ExFiles\Box 37\1\ scan 094 | |
| Date | 21th December 1920 | |
| X. 2375. X. 3129. 21.12.20. COMPARATIVE SPARKING OF WATFORD E.6 MAGNETO AND R.R. STANDARD BATTERY IGNITION ON UTILITY TEST. | | Maximum spark length (mm) for regular firing on one of six gaps fed in sequence from the distributor and across which is placed a feebly conducting path as below. | Maximum spark length (mm) for regular firing on one gap, fed direct from the coil and across which is placed a feebly conducting path as below:- | |---|---|---|---| | Nature of leakage. | Magneto. | Ignition coil. | Ignition coil. | | A.{Mr Adams} | None. | 5.0 | 8.5 | 9.5 | | B. | Secondaries of two Remy 12 cyl. 6 volt ignition coils in series, one primary closed. | 4.75 | 6.0 | --- | | C. | Ditto, both primaries closed. | 4.25 | 2.0 | 4.6 | | D.{John DeLooze - Company Secretary} | Secondary of one Remy 12 cyl. 6 volt ignition coil, primary closed. | 3.5 | 1.5 | 2.0 | Note:- The Utility Test consists in placing a feebly conducting path across one gap to represent the condition of a leaky sparking-plug. ---------------------- EFC. | ||