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).
Graphical chart recording an electrical test, displaying amperage over time.
| Identifier | ExFiles\Box 54\1\ Scan299 | |
| Date | 4th September 1928 | |
| 4-9-28 176-7 SUGSV 75a.l. A-9-28/1 (struck through) Average amperes = 6.32 Hours - 10.2 Ampere hours .64.5 1.80w. | ||