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 an electrical test measuring amperes over time.
| Identifier | ExFiles\Box 54\1\ Scan342 | |
| Date | 19th July 1929 | |
| 19-7-29 176-7 SU SV. 103lbs 75 a.h. Average amperes .6.32 Hours .5.5 Amperes hours .34.8. .338. 1.80w 5 6 7 8 9 10 11 0 1 2 3 4 5 | ||