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 showing the discharge curves for two proposed Phantom II batteries.
| Identifier | ExFiles\Box 58\4\ Scan046 | |
| Date | 12th February 1932 guessed | |
| DISCHARGE CURVES OF PROPOSED PHANTOM II BATTERY TAKEN ON ONE 6 VOLT UNIT VOLTS TIME (MINS.) EXIDE 3-XRR11-1H NATIONAL 3-BDH 11-A DISCHARGE CURRENT 185 AMPERES | ||