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).
Hand-drawn wiring diagram for a Midgley controller and cut-out unit.
| Identifier | ExFiles\Box 35\3\ scan 095 | |
| Date | 18th August 1926 guessed | |
| Terminal F D- + MAIN MIDGLEY CONTROLLER CUT-OUT UNIT D- F- B Charge & Discharge B- L- D+ SERIES B+ V Lamps + - DYNAMO F.C + REG. SERIES SHUNT D+ L- | ||