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).
Satisfactory trial of a Lucas headlamp dimmer switch.
| Identifier | ExFiles\Box 61a\1\ scan0119 | |
| Date | 8th October 1921 | |
| S/W EFC X.4291. C13/C8.10.21. X.4291. Head lamp dimmers. EFC5/T28.9.21. -------- We have tried this Lucas Dimmer Switch and it seems satisfactory. Would you like to see and try one? C.S RECEIVED OCT 10 1921 | ||