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 the results of an electrical battery discharge test.
| Identifier | ExFiles\Box 58\3\ Scan197 | |
| Date | 14th January 1930 | |
| 14-1-30 224 P & R + Exide NS{Norman Scott}1 11lbs. 75ah 3 Average amperes = 6.32 Hours = 10.0 Ampere hours = 63.2 .570 1.80v | ||