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 recording from an electrical test, showing a plotted graph and handwritten calculations.
| Identifier | ExFiles\Box 54\1\ Scan216 | |
| Date | 17th September 1926 | |
| 5 6 S2 7 8 9 10 11 12 1 2 3 17-9-26 155 S2 1/2 103 lbs. 75 a.h. REGO. TRADE MARK "MEGGER" Ampere hours = 58.6 Hours = 9.5 Average amperes = 6.16 570 1.80w | ||