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\ Scan073 | |
| Date | 8th March 1921 | |
| -7- Contd. (22b) Platinum point gap :- .008". Contact breaker timing:- | | Make. | Break. | |---|---|---| | A. {Mr Adams} | 17.5° | 100° | | R. {Sir Henry Royce} | 69° | 152.5° | | | Retarded. | Advanced. | |---|---|---| | Make. | 70° | 18° | | Break. | 152° | 100° | | Make. | 248° | 197° | | Break. | 333° | 280° | Make ratio :- .461. (23) Armature core flux Speed. Flux. 400 800 1200 1600 2000 2400 2800 8.3.21. | ||