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).
Report page showing open circuit voltage test results for various batteries.
| Identifier | WestWitteringFiles\D\May1920\ Scan48 | |
| Date | 17th May 1920 | |
| Contd. -3- 18 KFCL/17.5.20. the actual time on contact, which was respectively one half and one quarter of the total time in the (a) and (b) cases. The readings of amperes discharge and the corresponding check readings of voltage (for the purpose of ascertaining that the resistance of the circuit kept constant) were taken for every period at 10 seconds after making contact. Open circuit voltages were taken during each interval at 10 seconds before again switching on. These voltages gradually fell during the progress of the test in accordance with the following table, which gives the results for some of the batteries :- Battery Number. | Maker and type. | Test. | Open circuit Voltage at start. | Open circuit Voltage at finish. --- | --- | --- | --- | --- 12. | Tudor special. | III (a) (b) | 12.0 12.1 | 11.3 11.5 23. | Chloride 6 EXE 4/1. | (a) (b) | 11.7 12.0 | 10.9 11.0 18. | Chloride 6 EXE 5 (e) | (a) (b) | 12.2 12.2 | 11.3 11.4 27. | Chloride 6 PHR 7. | (a) (b) | 12.1 12.4 | 11.4 11.5 30. | Willard S.J.R. 27 | (a) (b) | 12.2 12.4 | 11.2 11.4 33. | Tudor R.F.1 | (a) (b) | 12.15 12.2 | 11.4 11.5 (upside down text at bottom) R.R. 235 A (100 T) (S.F. 846. 6-8-19) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2460. | ||