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).
Battery discharge test chart for a 'Sandwich battery S2 -E'.
| Identifier | ExFiles\Box 54\1\ Scan187 | |
| Date | 12th August 1925 | |
| 12-8-25 X4617 155 Sandwich battery S2 -E 103 lbs 80 a.h. REGD TRADE MARK 'MEGGER' Ampere hours = 6.42n Hours = 10.33 Ampere hours = 66.3. -646. 1.80w | ||