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).
The wiring requirements for incorporating an inspection lamp plug socket.
| Identifier | ExFiles\Box 40\2\ Scan019 | |
| Date | 6th August 1920 | |
| X.3552 Extract from EFC5/T6.8.20. X.3760. R.R. SWITCHBOX. X.4169. X 4173 X.3552. The system as at present arranged makes no allowance for an inspection lamp plug socket. I believe you have considered this point, but I would like to say that if it is suggested incorporating this on the switchbox, or even on the instrument board at the side of the swithbox, or even on the instrument board at the side of the switchbox, a sementh wire will be necessary coming from one of the positive terminals of the junction board, which with another connection from the five interconnected points will constitute the two poles of the plug socket. EFC. | ||