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).
The design and safety of the electrical fuse system, with suggestions for improvements.
| Identifier | WestWitteringFiles\D\February1920\ Scan13 | |
| Date | 7th February 1920 | |
| Contd. -2- Ck{Mr Clark}1/T7.2.20. (4). The main negative and control fuse holders are somewhat near together, making it rather difficult to securely catch hold of the control fuse holder for the purpose of removal. (5). There is no provision for spare fuses to be carried on this board. We suggest also that spare fuse holders are provided so that a pair of these could be always in readiness in a loaded condition. (6). On this board fuses are provided in the main negative and control circuits of the dynamo. As pointed out in our report Ck{Mr Clark}1/T3.2.20 (q.v.) such fuses are of limited value. Should not a fuse be provided in the field circuit as is done on the present Lucas board and by other makers of lighting systems ? Otherwise there is no protection against the dynamo windings being burnt out, should the battery become disconnected from any cause. (7). A main negative fuse is provided between the battery dynamo system and the remainder of the system, to which current is supplied, this means that if a "short" occurs anywhere on the consuming system, all supply is immediately cut off; should this happen on the road on a dark night, the consequences might be serious. Ck.{Mr Clark} | ||