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).
Graph chart detailing the results of what appears to be a battery discharge test.
| Identifier | ExFiles\Box 54\1\ Scan203 | |
| Date | 12th April 1926 | |
| 6 7 SU 8 X4617S 9 10 11 12 12-4-26 176 SU 104 lbs 75 a.h. REGD. TRADE MARK 'MEGGER' Immediately after charge. Average amperes = 6.21 Hours = 6.5 Ampere hours = 40.0 .384. 1.80w | ||