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).
Data log recording cell densities before and after a fourth charge cycle.
| Identifier | ExFiles\Box 48\3\ Scan039 | |
| Date | 10th March 1921 guessed | |
| -4- Contd. Date. (14) Cell densities. (1) 1140 (4) 1170 (2) 1160 (5) 1150 (3) 1160 (6) 1150. 4/4/21 (15) Fourth charge equivalent to average current of 5.0 amperes for 20.0 hours i.e. 100. ampere-hours. Cell densities :- (1) 1255 (4) 1280 (2) 1290 (5) 1280 (3) 1290 (6) 1260 7/4/21 [Signature] EFC. {E. Fowler Clarke - Electrical Engineer} R.R. 588A (100 T.) (S.G.) 643. 19-3-20 (M) G. {Mr Griffiths - Chief Accountant / Mr Gnapp} 2018 | ||