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 vibration test of a C.A.V. Willard 12XRE battery, showing charge and discharge capacities.
| Identifier | WestWitteringFiles\H\November1921\ Scan4 | |
| Date | 3rd November 1921 | |
| R.R.3283A(T.S) 2 H.G.(1-5-21) 300 C. To R & E.{Mr Elliott - Chief Engineer} from EPC. c. to CJ. & FH. c. to Rg.{Mr Rowledge} & Ds. c. to Ry. & EP.{G. Eric Platford - Chief Quality Engineer} c. to H.H. of America. ORIGINAL EPC2/T3.11.21. X.3937 -VIBRATION TEST OF C.A.V.WILLARD X4283 12XRE BATTERY. Referring to our EPC1/T12.8.21, describing the vibration test of standard battery, one of the 12XRE C.A.V. Willard batteries has now been put through this test, whilst undergoing several charges and discharges, the ampere hour capacities of which have been tabulated as follows :- CHARGE (at 6 amps DISCHARGE approx) No. | Hrs. | Amp.hours. | Hrs. | Average | Amp. | | | | amps. | hours. ------------------------------------------------------ 1 | 25½ | 153 | 5½ | 10.4 | 56 2 | 19 | 114 | 4½ | 10.5 | 50 3 | 12¼ | 73.5 | 4½ | 10.5 | 51 4 | 17¼ | 103.75 | 5 | 10.5 | 52.5 5 | 33 | 198 | 4½ | 10.5 | 48.5 6 | 22⅞ | 137.25 | 5 | 10.5 | 52.5 7 | 35⅞ | 215.25 | 4½ | 10.4 | 45.5 8 | 25⅞ | 153.25 | 4½ | 10.4 | 48 As in the previous case, the capacity of the battery is not materially affected by this treatment. This is shown by the figures tabulated, and also by the fact that subsequently the battery was found to be able to give 6 amperes discharge for 10 hours when standing. Failure of the battery Contd. | ||