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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 test of spark length for magneto and battery ignition systems under different leakage conditions.

Identifier  ExFiles\Box 4\5\  05-page123
Date  21th December 1920
  
X.2375.
X.3128.

COMPARATIVE SPARKING OF PAT GMD K.6 MAGNETO AND R.R. STANDARD BATTERY IGNITION ON UTILITY TEST.

| Nature of leakage. | 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 :- |
|---|---|---|
| | 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 | 4.5 |
| 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.
  
  


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