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 49\5\ Scan169 | |
| Date | 8th March 1921 | |
| -7- Contd. (22b) Platinum point gap :- "003" and "008" Contact breaker timing:- | | Make. | Break. | |-----|---------|----------| | A. {Mr Adams} | -87° | +71.5° | | R. {Sir Henry Royce} | -26.5° | +131.5° | | | Retarded. | Advanced. | |-------|-----------|-----------| | Make. | -27° | -87° | | Break.| 130° | 71° | | Make. | 154° | 93° | | Break.| 313° | 252° | Make ratio :- .880 (23) Armature core flux | Speed. | Flux. | |--------|-------| | 400. | | | 800 | | | 1200 | | | 1600 | | | 2000 | | | 2400 | | | 2800 | | 8.3.21. | ||