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).
Chart recording of a battery discharge test showing a steady current over time.
| Identifier | ExFiles\Box 54\1\ Scan248 | |
| Date | 9th November 1926 | |
| 5 6 SJ 7 8 X46975 9 10 11 12 9-11-26 172 SJ 103 lbs 75 ah. Average amperes = 6.02 Hours = 6.25 Ampere hours = 37.6 .365 1.80w. PECCA TRADE MARK 'MEGGER' | ||