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 detailing voltage, RPM, gap measurements, and endurance test results.
| Identifier | ExFiles\Box 69\1\ scan0296 | |
| Date | 23th December 1929 guessed | |
| -4- (9) Remarks :- At 10 volts :- 1890 r.p.m. At 8 volts :- 1360 r.p.m. (10) Maximum gap and corresponding voltage. .084" - 9200 volts. (11) Remarks:- Maximum gap .178 inches. (12) Remarks :- Run without any sign of weakness 500 hrs OK. | ||