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 page detailing the results of short circuit, open circuit, and RPM tests, along with measurements and sparking speed data.
| Identifier | ExFiles\Box 48\2\ Scan157 | |
| Date | 21th August 1924 guessed | |
| Contd. -4- (10) Short circuit test :- OK (11) Open circuit test :- Safety gap too large. (12) Test at 1500 R.P.M. :- OK (13) (a) 10.7 m.m. (b) 2.7 m.m. (c) 2.3 m.m. (d) 1.1 m.m. With 3.5 annular gap and 3 micromho chemical leak Advance . Retard Maximum regular sparking speed - 960 , 2150rpm Minimum " " " - 800 , 1250- (14). | ||