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 plotting performance data with calculations after the subject stood for 14 days.
| Identifier | ExFiles\Box 54\1\ Scan202 | |
| Date | 8th April 1926 | |
| 6 7 SU 8 9 10 8-4-26 176 SU 104 lbs 75 a.h. REGD. TRADE MARK GECER After standing for 14 days. Average amperes = 6.21 Hours = 5.25 Ampere hours = 32.6 .314. 1.80w | ||