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 chart displaying test results with handwritten annotations.
| Identifier | ExFiles\Box 54\1\ Scan330 | |
| Date | 1st June 1926 | |
| SY 1-6-26 170 SY 103 lbs 75 e.h. Average amperes = 6.26 Hours = 9.25 Ampere hours = 58.0 564 1.80w REGD TRADE MARK T M & G CERT | ||