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 electrical wiring diagrams for a controller and cut-out unit.
| Identifier | ExFiles\Box 59\1\ Scan071 | |
| Date | 4th October 1923 | |
| Top Diagram: G+ F- CONTROLLER B- L- D+ CUT-OUT B+ Lamps Left margin (faint): Controller Cut Out Bottom Diagram: B- D- F(-) Controller To Lamps L- D+ Cut-out B+ Bottom right corner: 730 4-10-23 E7 | ||