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).
Specifications for platinum point gap, contact breaker timing, and armature core flux.
| Identifier | ExFiles\Box 48\2\ Scan081 | |
| Date | 8th March 1921 | |
| -7- Contd. (22b) Platinum point gap :- ·010" Contact breaker timing:- Make. Break. A. {Mr Adams} 11° 93° R. {Sir Henry Royce} 64° 145° Retarded. Advanced. Make. 64° 11° Break. 45° 93° Make. 244° 190° Break. 325° 273° (N.B Automatic advance subtracted) Make ratio :- ·45 (23) Armature core flux Speed. Flux. 400 800 1200 1600 2000 2400 2800 ____ ____ 8.3.21. | ||