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).
Wiring diagram scheme for Lucas W.T. horns.
| Identifier | ExFiles\Box 59\3\ Scan352 | |
| Date | 9th October 1935 guessed | |
| Rolls-Royce SCHEME FOR LUCAS. W.T HORNS. R.{Sir Henry Royce} "A" S L An ADDITIONAL WINDING "A" IS PROVIDED ON THE HORN RELAY AND THE CIRCUIT RE-ARRANGED. | ||