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).
Circuit diagram for a starter motor actuation system.
| Identifier | WestWitteringFiles\K\June1923\ Scan33 | |
| Date | 9th September 1920 | |
| X4168G. STARTER MOTOR ACTUATION To R15/G 23.8.20 Battery Push Button Switch C Main Switch Two-way relay switch D A B Actuator Box (with auxiliary contact) Starter Motor E.7.C 9/9/20 | ||