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).
Two circuit diagrams for a tail lamp and indicator lamp system.
| Identifier | ExFiles\Box 60\3\ Scan015 | |
| Date | 22th April 1927 guessed | |
| Tail lamp Relay Tail lamp switch Supply Indicator lamp Thermometer contacts Fig.1. Shunt Series Fig.2. | ||