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).
Graphical chart recording the performance test of a Sandwich Battery.
| Identifier | ExFiles\Box 54\1\ Scan329 | |
| Date | 27th November 1925 | |
| 7 SY 8 27-11-25 Sandwich Battery SY (170) goal 100 a.h. Average amperes = 6.39 Hours = 9.25 Ampere hours = 59.0 .590 1.800 REG. TRADE MARK "MEGGER" | ||