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).
Test report comparing the volt-ampere capacity and figure of merit for various aero magnetos.
| Identifier | ExFiles\Box 4\5\ 05-page340 | |
| Date | 14th April 1928 | |
| Aero magnetos. MAGNETO TESTS - VOLT AMPERE CAPACITY AND FIGURE OF MERIT. Magneto. | Type. | No. | Volt-ampere capacity. | Figure of merit. Dixie | 648 | 718237 | 19.45 | 1.39 B.T.H | SC12-7 | 737191 | 31.2 | 1.93 " | " | 913347 (Chiglaned) | 31.25 | 2.03 " | " | 949259 | 31.10 | 2.03 R Bosch | GF12 | 33481 | 34.10 | 2.24 Scintilla | GN12 | 81847 | 35.25 | 2.17 Watford | IS12 | 83134 | 31.8 | 2.12 14.4.28. | ||