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).
Results of various electrical component tests including voltage and coil temperature.
| Identifier | ExFiles\Box 164\5\ img075 | |
| Date | 17th August 1931 guessed | |
| -4- (9) Low voltage test. At 10 volts :- 1800 r.p.m. At 8 volts :- 578 r.p.m. Minimum voltage :- 8.8 volts (10) Measurement of secondary voltage. Maximum gap and corresponding voltage. .072" 8180 volts. (11) Effect of coil temperature on secondary voltage. Run 2 hrs at 17.5v. 80°C. Maximum series gap :- Volts = 6400 volts. (12) Endurance Test. | ||