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).
List of electrical and mechanical specifications including resistance, current, point gaps and contact breaker timing.
| Identifier | ExFiles\Box 49\5\ Scan168 | |
| Date | 8th March 1921 guessed | |
| -6- Contd. (18) Primary resistance :- .73ω at 18°C. Inst 98. 1.5v range. " " " " 1.5amp " (19) Secondary resistance :- 3,980ω at 20°C Inst 98. 1.5v range " .22596.ma. " (20) Secondary milli-amperes :- Horizontal Position :- 9.9. Vertical position :- 8.2. (21) Platinum point gap :- .007" and .012". (22a) Platinum point gap :- .011" and .016". Contact breaker timing :- | | Make. | Break. | |---|---|---| | A. {Mr Adams} | -84.5° | +69° | | R. {Sir Henry Royce} | -25 | +128° | | | Retarded. | Advanced. | |---|---|---| | Make. | -25 | -84° | | Break. | 127° | 69° | | Make. | 155° | 95 | | Break. | 309° | 249 | Make ratio :- .853. Contd. | ||