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\ Scan072 | |
| Date | 8th March 1921 guessed | |
| -6- Contd. (18) Primary resistance :- .311 w at 18.4 C Inst 92 on 1.5 volt + ampere ranges. (19) Secondary resistance :- 11,940 w at 20.5 C. Inst 92 on 15 volt range. " 22596 on m a range. (20) Secondary milli-amperes :- Horizontal Position :- 1.c. With poles of magnet across armature pole-pieces. 3.5 Vertical position :- 1.0 (21) Platinum point gap :- .011". (22a) Platinum point gap :- .016". Contact breaker timing :- Make. Break. A. {Mr Adams} 20° 97.5° R. {Sir Henry Royce} 72.5° 150° Retarded. Advanced. Make. 73° 20° Break. 150° 97° Make. 252° 200° Break. 330° 278° Make ratio :- .431. Contd. | ||