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).
Battery construction, detailing issues with plates, wood and ebonite separators, and summarising potential faults.
| Identifier | ExFiles\Box 164\4\ img017 | |
| Date | 1st February 1931 | |
| EFC {E. Fowler Clarke - Electrical Engineer} 2/AERO.2.31. contd. -2- The thinner plate is more easily buckled and will not retain the paste so effectively, particularly with the type of grid used having the apices of the grid bars facing outward. Two feet are provided on each plate giving independent support on 4 bridge bars. Wood Separators. These separators are very thin and delicate, the thickness being .062" (1.51 mm.) and the flesh .034" (.86 mm.) in a wet state. Ribs are provided on one side only. Ebonite Separators. These separators are of the slotted perforated type and are .017" (.43 mm.) thick. The separators in our standard batteries are perforated with circular holes recently adopted by the Chloride Co. as being better than the slotted type. All the separators project well over the edges of the plates. The depth allowed for collection of sediment is 1.000". Generally speaking, this battery is not a good sound job as compared with our standard battery. The plate lugs are not cleaned before burning on to the strap making this appear a poor job. This battery is not expected to give a good life, for one reason the thin plates are more easily damaged from over-sulphation." Summarizing the results in the above report it will be seen that :- (1) There will be some difficulty in realising efficient arrangement of the cables and terminals. (2) There may be trouble with the battery as a result of the softness of the sealing compound. | ||