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 several curves with a vertical axis labelled 'Voltages' and another line indicating a constant voltage of 14.0.
| Identifier | ExFiles\Box 163\6\ img149 | |
| Date | 5th May 1932 guessed | |
| 40/50 AT CONSTANT VOLTAGE OF 14.0 1 2 3 VOLTAGES 17 18.70 16 18.50 15 18.30 14 18.10 13 17.90 12 17.70 11 17.50 10 17.30 9 17.05 8 16.80 | ||