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).
Specification sheet detailing electrical resistance, current, point gaps, and contact breaker timing.
Identifier | ExFiles\Box 48\2\ Scan159 | |
Date | 13th May 1924 guessed | |
-6- Contd. (18) Primary resistance :- .34 ohms at 13°C (Instrument NO 98 on 1.5 volt and ampere ranges) (19) Secondary resistance :- 6375 ohms at 15°C (Instrument NO 98 on 1.5 volt range Instrument NO 22596 direct on Instrument) (20) Secondary milli-amperes :- Horizontal position :- 5.8 Vertical position :- 2.1 (21) Platinum point gap :- .012" (22a) Platinum point gap :- .016" Contact breaker timing :- (auto + hand) | Make. | Break. | |---|---| | A. {Mr Adams} | 19° | 97.5 | | R. {Sir Henry Royce} | 77° | 155° | | | Retarded. | Advanced. | |---|---|---| | Make. | 75° | 17° | | Break. | 155° | 98° | | Make. | 259° | 202° | | Break. | 335° | 277° | Make ratio :- .433 Contd. | ||