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 arrangement and necessity of fuses in dynamo circuits and distribution board connections.
| Identifier | ExFiles\Box 61\2\ scan0266 | |
| Date | 19th August 1919 | |
| To R.{Sir Henry Royce} from EFC. c. to CJ. c. to E.{Mr Elliott - Chief Engineer} c. to Bn.{W.O. Bentley / Mr Barrington} c. to Da.{Bernard Day - Chassis Design} X.2515 EFC1/AT19.8.19. X.2515. RE FUSES IN DYNAMO CIRCUITS X.3555. DISTRIBUTION BOARD CONNECTIONS. Referring to Lec.1125 Distribution Board Connections, we note that you have shewn two fuses, one in the main circuit and one in the control circuit of the dynamo. We would like you to say, in view of our reports EFC1/T10519, EFC3/T20519, whether you think this a more satisfactory arrangement than having a single fuse in the field circuit. The disadvantages we can see in the latter case is that the fuse has to be of such fine wire that the contact may be impaired. It appears to us that we either ought to have a fuse in each of three wires, the main, control, and field, or else have no fuses at all. Our own feeling in the matter, owing to disadvantages already mentioned, would be to simplify the system by dispensing with fuses altogether in the dynamo circuit. We feel that the apparatus ought to be and could be, as good that no fuses would be required. The placing of a fuse seems rather to us like an acknowledgment that the apparatus, particularly the cut-out, is not as good as it could be. We had made certain criticisms of this matter to Messrs. Lucas with which, apparently, they agreed, for in further switchboxes which they have delivered to us, they have deleted the fuses in the main and control circuits and placed instead a fuse in the field circuit. This they have done with-out being definitely asked to do so by us. Eontd. | ||