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).
Points regarding the emergency fuse on the Goshawk system and the inspection lamp wiring.
| Identifier | WestWitteringFiles\J\December1922\ Scan63 | |
| Date | 12th December 1922 | |
| Contd. -3- EFC/TS.12.22. Further points that have occurred to us. (1) The emergency fuse on the Goshawk system as at present need to be of large current carrying capacity, so as only to go in extreme emergency, owing to the serious result of disconnecting the dynamo from the battery. When this serious consequence is removed the fuse need not be so large in capacity and will therefore enable us to dispense with the two fuses in the dynamo positive and field leads, which only exist for the purpose of protecting against dead earths occurring on the dynamo terminals. The fuses at present provided on the Goshawk positive and field dynamo wires cannot prevent the battery being discharged through the dynamo when the charging switch is left on and the cutout sticks in. If sufficiently low in current carrying capacity to do this, they would not safely carry the normal current, hence with the lighter emergency fuse, they might be dispensed with. (2) It could readily be arranged, as shown on diagram, that as regards the socket for the inspection lamp plug, the return connection of this did not go to earth but to the negative of the battery, so that the inspection lamp would still be available in the event of failure of this fuse on the road at night. EFC. | ||