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 a battery vibration test and the subsequent examination of the cells.
| Identifier | WestWitteringFiles\G\August1921\ Scan47 | |
| Date | 13th August 1921 | |
| Contd. -2- Examination of these figures will show that the ampere-hours of each charge have been roughly the same. It will be noted that the ampere-hours of discharge have not materially altered during successive discharges. The nature of the vibration treatment which the battery underwent will be understood by a short description of the vibration apparatus. This consists of a platform pivoted at one end, raised repeatedly at the other end by a revolving cam, and allowed to drop at that end on to rubber pads through a distance of about 1.5", the frequency of falls being 45 per minute on the average. The platform being about twice the length of the battery, and one end of the battery being at the end of the platform over the cam, the (inner) end of the battery nearer the pivot only receives approximately half the vibration treatment which the outer end receives. Although the test appears drastic, it is remarkable how well the elements stood this a treatment. Failure of this battery actually took place outside the cells by one of the flexible connecting links giving way in the middle of its length between the terminals, a failure such as would never be expected to occur on the road. The subsequent examination of the cell at the extreme outer end where the vibration was a maximum, showed the elements to be in almost perfect condition electrically. Contd. | ||