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 for the operation of Lucas W.T. horns, ensuring a loud or soft sound based on the button position.
| Identifier | ExFiles\Box 59\3\ Scan356 | |
| Date | 24th October 1935 guessed | |
| ROLLS-ROYCE SCHEME FOR THE OPERATION OF LUCAS. W.T. HORNS TO ENSURE THAT THE HORNS SOUND "LOUD" WHEN THE BUTTON IS DEPRESSED IN ANY POSITION EXCEPT WHEN DEFINITELY ROCKED TO THE "SOFT" POSITION. RELAY CONTACTS RESISTANCE FOR SOFT NOTE. RELAY CONTACTS. BUTTON. S. L. | ||