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).
Table of results of magneto performance tests.
| Identifier | ExFiles\Box 4\5\ 05-page303 | |
| Date | 21th August 1924 | |
| 2A. X.430. TABLE OF RESULTS OF MAGNETO PERFORMANCE. Date. | Magneto. | Type & No. | X.No. | (1) Weight (lbs) | (2) Air gap (Inches) | (4) H.T. safety gap (mm) | (5) Platinum gap (inches) | (6) Range (º) | (8) Make ratio. | (13) Utility test spark lengths (mm) (a) | (b) | (c) | (d) --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- - | Eisemann. | GN.6. | 179 | 16.9 | Unobtainable. | 7.5 | .013 | 30 | .841 | 8.7 | 8.7 | 6.4 | 6.6 - | B.S.A. Bosch. | DUZ.6 33370 | 4285 | 14.4 | * | 8.5 | .016 | 35 | .870 | 8.5 | 8.5 | 8.0 | 7.0 23.11.21. | - | ZRS. Ed.{J. L. Edwards}19 33010 | 3916 | 15.4 | .003 | 8.6 | .016 | 36 | .870 | 8.5 | 8.0 | 6.7 | 5.3 25.4.22. | Watford. | EO6c. 50410 | 4181c. | 13.8 | .006 | 7.6 | .016 | 33 | .881 | 6.5 | 5.3 | 3.5 | 2.4 19.7.22. | - | ELOS 55044 | 4279 | 17.7 | Unobtainable. | 10.0 | .011 | 62 | .882 | 6.75 | 6.75 | 6.5 | 4.0 16.5.24. | Scintilla | AG6-A 21523 | 4187 | 14.3 | * | 10.6 | .012 | 50 | - | - | - | - | - 7.4.24. | - | AM6-A 26485 | 4187 | 12.5 | * | 11.5 | .012 | 53 | .463 | 8.5 | 2.7 | 1.0 | .7 - | - | AV6-A 34937 | 4187 | 12.75 | * | 11.8 | .013 | 53 | .432 | 10.95 | 6.75 | 2.4 | 1.1 16.7.24. | - | AV6-A 28531 28533 | 4187 | 12.5 | * | 11.15 | .012 | 52 | - | 12.0 10.2 | 6.6 4.3 | 2.5 2.0 | 1.0 .5 21.8.24. | - | AG6-A 34903 | 4187 | 14.5 | * | 11.2 | .011 | 57 | .453 | 10.7 | 2.7 | 2.3 | 1.1 Side note: X.430 | ||