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 showing the results of an electrical battery discharge test.
| Identifier | ExFiles\Box 54\1\ Scan199 | |
| Date | 1st April 1926 | |
| 6 7 SV 8 S.V. 9 1-4-26 10 11 31-3-26 177 Sandwich SV 103 lbs 75 ah REGD TRADE MARK "MEGGER" Average amperes = 6.39 Hours = 6.40 Ampere hours = 40.8 .396 1.80w | ||