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).
Modification of connections for the accessory distribution box.
| Identifier | ExFiles\Box 168b\2\ img205 | |
| Date | 1st July 1930 | |
| Ry. from EFC. X7560 EFCl/Ad1.7.30. X.7560. X.7741. CONNECTIONS OF ACCESSORY DISTRIBUTION BOX. Further to our EFC6/AD9.7.30 it now appears, on consideration of a somewhat different aspect of this matter, desirable to recommend the removal of the connecting link on the accessory distribution box from the dynamo side of the ammeter to the battery side of the ammeter. This would appear more logical in view of the fact that the heavier currents are to be supplied from the battery side of the ammeter, and if these are all made to pass through the same fuse there is the possibility of this fuse going, and what is most important, putting the starter relay system out of action. When cigar lighters are fitted there are generally two fitted, and if these were utilised (as they might be) at the same time this might blow the fuse on which the starter relay system depended. On the other hand, one single fuse would probably be amply sufficient for all the continuous accessory currents supplied via the ammeter. We therefore recommend that the link be transferred to the other side so that two fuses are supplied from the battery side of the ammeter one of which could be used for the starter circuit and one for the supply to the cigar lighting junction box as referred to in our EFC6/AD9.7.30. We think you will agree to the desirability of this modification, but if you see any other reason why it should not be done we should be pleased to hear of it and to compare if you are in favour of retaining the arrangement as at present. It will be remembered that when we originally suggested this arrangement it was intended that this link could conveniently be moved from one side to the other so as to put the central fuse on the circuit supplying either through or not through the ammeter as desired. | ||