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).
Battery charging test chart for an Exide TR battery, recording amperes over time.
| Identifier | ExFiles\Box 54\2\ Scan131 | |
| Date | 8th July 1926 | |
| 8·7·26 Exide TR {Capt. F. W. Turner - Finance} 75 a.h. 100 lbs Charged on a fixed PD of 17 volts with a .25 ohm resistance in series. REGD. TRADE MARK "MEGGER" Average amperes = 6.38 Hours = 8.1 Ampere hours = 51.6 .5/6 1.80w | ||