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).
Electrical system protection, comparing the use of a buzzer versus a main fuse as an alternative to a full fuse set.
| Identifier | ExFiles\Box 51\2\ Scan023 | |
| Date | 19th September 1921 | |
| EPC3/T19.9.21. -3- Contd. perfectly satisfactory all round, and it is therefore always difficult to see just the [strikethrough]most satisfactory[/strikethrough] arrange- ment in practice. If, however, all fuses were omitted and a series operated buzzer included in the positive wire leading from the battery which would give audible warning in the case of excessive current leaving the battery, this would seem to be a very good arrangement, particularly in view of the fact that with only a battery ignition fitted, the car cannot be starte-d without the battery connected. [Handwritten insertion: with battery disconnected] (If it could, nothing could prevent damage being done to lights by over-voltage, or dynamo by roasting). Thus there is no escape whatever from some possibility of damage, except by coming to a perfectly reliable vibrator control of the voltage by which it cannot rise above normal, in which case the necessary and sufficient protection would be afforded by a main fuse in the positive wire leading from the battery. EPC. | ||