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 from an electrical test showing amperes over time.
| Identifier | ExFiles\Box 54\1\ Scan167 | |
| Date | 3rd November 1926 | |
| 3-11-26 182 PaRRRII-3 97 lbs 75 a.h. Average amperes = 6.2 Hours = 11.7 Ampere hours = 72.6 .75 1.80w REG. TRADE MARK "MEGGER" | ||