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 recorder graph showing the results of an electrical test, likely a battery discharge test.
| Identifier | ExFiles\Box 58\3\ Scan200 | |
| Date | 22th December 1930 | |
| 22-12-30 215/6 P+R RRNII-3+4 114 lbs. 75 a.h. Average amperes = 6.44 Hours = 13.25 Ampere hours. = 85.5 .750 1.80w | ||