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 dismantling and inspection of a P & R battery from vehicle 28LK.
| Identifier | ExFiles\Box 46\3\ Scan149 | |
| Date | 3rd September 1924 | |
| EFC. {E. Fowler Clarke - Electrical Engineer} COPY. 3.9.24 JB.62. RE DISMANTLING OF P & R BATTERY FROM 28LK. {L. King} The following are the faulty and good points noted in thed dismantling of the above battery. General. The cell to cell connections appeared to be broken, but upon investigation it was found that only the lead coating was cracked, the stranded wire running through the centre was quite intact. In consequence of these being faulty copper strips were put across and fixed by screws, which screwed into the cell lugs, but neither the links or the lugs were cleaned to make good contact, the point still adhering to same. These would not improve it much because of the poor contact. The sealing compound had cracked round the cell lugs enabling the plates to wobble about and at the same time they had sunk in. Battery box in excellent condition. Interior of cell No.1 All plates in excellent condition except one positive, which appears as though it has not been pasted at one corner. The grids are also in good condition. The positive and negative plates have, due to vibration and chafing, worn down at the feet and former arches and consequently have rested on all the four supporting ribs, at the same time wearing the ribs away where the plates have chafed them. The separators have worn away in the same manner as the plates, only the arches are much deeper, some of them have worn so thin that there is nothing left to stop the plates touching each other and shorting. A fair amount of sediment was found in the bottom and only about ¼" being allowed for this room. With the ribs being worn about ¼" down and the plates being also worn, this sediment room was considerably less than the ¼" and the plates were therefore in contact with the sediment and causing partial short circuit. This battery must have received a great amount of vibration, or has been roughly used, to have got into this condition, as it would not have done so with fair treatment. No.4 cell was afterwards opened up and was found to be in a similar condition, as No.1, only that the plates were not worn so much at the feet. The cell cases are a strong and durable job. GJ. | ||