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).
Note about the circuit placement of a buzzer versus fuses, referencing a wiring diagram to follow.
| Identifier | ExFiles\Box 163\7\ img034 | |
| Date | 22th July 1921 | |
| Contd. -5- H10/G22.7.21. or a buzzer is used. Apparently the buzzer could only be in the circuit as shown in the wiring diagram attached, whereas the fuses can be in any circuit it is desired to fit them. R.{Sir Henry Royce} Wiring diagram to follow. | ||