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 an electrical test, showing amperage over time.
| Identifier | ExFiles\Box 54\1\ Scan157 | |
| Date | 11th July 1924 | |
| 47 11-7-24 147 P&R RRII/1 103 lbs 80 a.h. P Average amperes = 6.6 Hours = 8.0 Ampere hours = 52.8 .513 1.80w BRITISH MADE - MEGGER EVERSHED & VIGNOLES LTD. CHISWICK. LONDON W. | ||