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 showing the results of an electrical test, likely a battery discharge curve, with handwritten calculations.
| Identifier | ExFiles\Box 54\1\ Scan312 | |
| Date | 25th October 1928 | |
| Top Header: 25-10-28, 154, S1, 75 a.h., 103 lbs. Calculations: Average amperes = 6.25, Hours = 8.0, Ampere hours = 50.0 Bottom Annotations: .485, 1.80w Vertical Watermark: RECORDING CHART. TRADE MARK. X-axis: 5, 6, 7, 8, 9, 10, 11, 12 Y-axis: 1, 2, 3, 4, 5 | ||