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).
Log of battery charging and performance data, including cell densities and ampere-hour calculations.
| Identifier | ExFiles\Box 38\5\ Scan181 | |
| Date | 16th December 1921 guessed | |
| (3) Contd. Date. (12) Cell densities:- (1) 1140 (4) 1120 (2) 1110 (5) 1140 (3) 1110 (6) 1145 9.12.21 (13) Third charge equivalent to average current of 6 amperes for 18 hours i.e. ampere-hours = 108 9-12-21 10.12.21 (14) Cell densities. (1) 1285 (4) 1280 (2) 1280 (5) 1285 (3) 1280 (6) 1280 12.12.21 (15) Initial amperes = 115 Time to 104 amperes = 5/5 mins. " " 100 " = 10.2 " " " 90 " = 14.3 " " " 80 " = 15.25 " 12.12.21 (16) Fourth charge equivalent to average current of 6 amperes for 18 hours i.e. ampere-hours = 108 12-12-21 13-12-21 (17) Ampere-hours realised up to a point where record takes a sudden turn down: -50.8 16.12.21 Cont.d | ||