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).
Bench test results for the Eisemann Magneto Type G.N.6.
| Identifier | ExFiles\Box 4\5\ 05-page183 | |
| Date | 14th April 1921 | |
| Contd. -2- EPC3/T14.4.21. As regards results obtained on bench tests of the Eisemann magneto, these given in tabular form in the same order as given in the table dated 23.3.21 under cover of our EPC5/T31.2.21, are as follows :- Magneto.Eisemann Type G.N.6. Weight 16.89 lbs. Air gap - unobtainable. High tension safety gap (mm). 7.5 Platinum gap. .013" Range. 30° Make ratio. .541 Utility test. Spark lengths (mm) (a) 8.7 (b) 8.7 (c) 8.4 (d) 6.6 Degrees of make. 150.5 Maker's make advanced 53.5° " break " 97° Our break advanced 97° " retarded 131° Lowest speeds for regular sparking over 5.5mm. gaps in air - Advanced. 155 r.p.m. Central. 176 r.p.m. Retarded. 238 r.p.m. Advanced position same as maker's but more advanced than to allow regular sparking by about 7°. Primary resistance (ohms) .68 at 17°C. Secondary resistance (ohms) 2,665 at 18°C. Secondary milli-amperes at 108 volts 50~ Maximum 14.5 horizontal. Minimum 5.9 vertical. KFC. | ||