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).
Graph record of a battery being charged at a continuous current.
| Identifier | ExFiles\Box 54\1\ Scan233 | |
| Date | 5th January 1927 | |
| 5-1-27 154/ S1 X4617 S1 Battery charged at a continuous current of 6 amperes. Average amperes = 6.07 Hours = 9.0 Ampere hours = 54.7 REGD TRADE MARK "MEGGER" .542 1.80w. | ||