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).
Performance graph detailing average amperes, hours, and ampere-hours after a mileage test.
| Identifier | ExFiles\Box 54\1\ Scan243 | |
| Date | 15th February 1927 | |
| 15 - 2 - 27 155 S2 75 A. {Mr Adams} HRS. 101 LBS AVERAGE AMPERES = 6.24 HOURS - 10.25 AMPERE HOURS - 64.0 .634 1.80 W AFTER 13377 MILES | ||