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 component test.
| Identifier | ExFiles\Box 54\1\ Scan171 | |
| Date | 11th July 1927 | |
| 11-7-27 182 P&R RRII-3 75 a.h. 97 lbs. charged to modified characteristic of V = 10 - .15A for 10 hours. Average amperes = 6.4 Hours = 13.0 Ampere hours = 83.2 .859 1.80ω | ||