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).
Characteristic curve graph for a Ferranti A.C. Rectifier Milli-Ammeter at an ambient temperature of 16°C.
| Identifier | ExFiles\Box 165\3\ img075 | |
| Date | 9th July 1930 guessed | |
| VOLTS (A.C.) Milli-AMPERES APPROX. CHARACTERISTIC OF FERRANTI A.C. RECTIFIER Milli-AMMETER No. 30131 (Ambient Temperature 16°C) Immediate Final 100 Ohms X475. /LO 033 28.3 No. 3338 | ||