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).
Analysis of the dynamo-battery charging circuit, its current path, and potential points of failure.
| Identifier | ExFiles\Box 61\2\ scan0244 | |
| Date | 14th September 1936 | |
| Contd. -4- The current path from the commutator under the negative brush via the cutout contacts and the series coil to earth, and also that between the switchbox and the positive terminal of the battery via the ammeter and main fuse in distribution box, are for certain technical reasons, more particularly important than the others in the respects considered. Although this type of dynamo-battery system is of great practical use because of its reasonably satisfactory behaviour when everything is looked after and kept in proper order, nevertheless it does provide loop-holes for failures of and damage to units of the system when supervision is not up to scratch, e.g. burnt out armatures, fuses blowing, life of battery reduced, or battery electrolyte being evaporated away, etc. etc. It will now be realised that the portions of the electrical system in need of supervision in this respect are those through which the actual dynamo-battery charging current circulates. Assuming, as I think we may fairly well do, that all electrical resistances due to joints between members of the chassis frame are negligible, circuits starting from the metal work of the dash take (on our 40/50 HP. chassis) the following route, items on the right being continuous metallic paths and those on the left being joints (pressure connections):- Contd. | ||