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).
Results of disintegration tests conducted on battery plates.
| Identifier | WestWitteringFiles\G\June1921\ Scan112 | |
| Date | 23th June 1921 | |
| To R & E.{Mr Elliott - Chief Engineer} from EFC. c. CJ. & PN.{Mr Northey} c. En. & By.{R.W. Bailey - Chief Engineer} c. EP{G. Eric Platford - Chief Quality Engineer} & Da.{Bernard Day - Chassis Design} c. EWT. for R.R.Inc. EFC5/T23.6.21. X.3978 - DISINTEGRATION TESTS OF BATTERY PLATES We have just completed some disintegration tests of Chloride grids (unpasted) in which these were subjected to long continued overcharging at slow rate with occasional discharges, over a period from Sept. 1st. last to the present. These tests have proved that positive grids, although made of antimonial lead, do deteriorate in time. The grids, with the exception of the bottom and side bars become very fragile, and the spars of the grid become easily broken at the slightest touch; some of them already having parted, and a deposit of quite a heap of oxide on the bottom of the glass cell in which the grids were discharged. Hence it would appear that the sacrifice of the little efficiency in making plates more robust is desirable, as there can be no doubt that thicker spars would stand up longer against this eating away. In the more recent Exide and Tudor batteries we have got the makers to do this at a slight loss, as already stated elsewhere, of electrical efficiency. The grids which were made negative have experienced no deterioration but appear to be preserved by the reducing action of the charge. EFC. | ||