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).
Page 2 of a report detailing the results of a battery discharge test and future testing plans.
| Identifier | ExFiles\Box 9\6\ 06-page50 | |
| Date | 14th May 1920 guessed | |
| -2 Contd. time reckoned being, not the total time elapsing, but the actual time on contact. Finally we recharged the battery and discharged on the recording voltmeter. The current at the start was about 10 amperes and the discharge was allowed to continue until the slope of the curve made a sudden change in the downward direction, this point corresponding to about 10 volts on the terminals at 8.2 amperes discharge. The time to attain this point was 4.45 hours, showing that the capacity had not been materially reduced by the high rate discharges. Compared with other batteries we have tested, the results given above are only moderately good and, therefore, as explained to your Mr. Wilson, we should not consider adopting this type of battery as standard at the moment. We admit that comparison has not been made between this and other batteries in every possible direction, such as life tests under vibration, but we hope to do tests of this nature in the near future and probably to put this battery amongst those selected for such test. Yours faithfully, MADE AT CROXLEY R.R. 63 (40 T) (S F.{Mr Friese} 846) 6-8-191. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2489 | ||