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, contact breaker timing, and armature core flux.
| Identifier | ExFiles\Box 48\2\ Scan160 | |
| Date | 13th May 1924 | |
| -7- (22b) Platinum point :- .008" Contact breaker timing:- (Table 1) Make. Break. A. {Mr Adams} 14° 102° R. {Sir Henry Royce} 71° 159.5° (Table 2) Retarded. (Auto + Hand) Advance.d. Make. 66° 9° Break. 159° 101.5° Make. 256° 199° Break. 340° 282° Make ratio :- .472 (23) Armature core flux Speed. Flux. 400 800 1200 1600 2000 2400 2800 ____ ____ 13.5.24. | ||