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 of ampere output curves for various plain shunt wound dynamos under cold and hot conditions.
| Identifier | ExFiles\Box 37\2\ scan 104 | |
| Date | 25th September 1920 | |
| AMPERE OUTPUT CURVES OF PLAIN SHUNT WOUND DYNAMOS FOR COLD AND HOT CONDITIONS II. OPERATING UPON 12 VOLT BATTERY CIRCUIT OF DEFINED VOLT AMPERE CHARACTERISTICS SEE SCALES. ONE CHARACTERISTIC FOR EACH OF HOT AND COLD CONDITION. OPERATING VOLTAGES (NOT APPLICABLE TO LIBERTY) COLD HOT 16 15.6 15.6 14 15.2 15.35 12 14.8 15.1 10 14.4 14.85 A.{Mr Adams} B. 8 14.0 14.6 6 13.6 14.35 4 13.2 14.1 2 12.8 13.85 0 12.4 13.6 Y-Axis: AMPERE OUTPUT X-Axis: DYNAMO SPEED (R.P.M) X-Axis Scale: 0, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500 NOTE: The Smith dynamos were converted to simple shunt machines by removing the control brushes and setting the main brushes in the exact neutral position. The Liberty being an 8 volt dynamo and operating upon a 4 cell battery the operating voltages indicated are approximately 2/3 of those shown by the scales. Curve Labels: BOSCH (20°C) SMITH 2D (20°C) BOSCH (78°C) BIJUR (20°C) SMITH A (24°C) SMITH 2D (84°C) BIJUR (70°C) SMITH A (82°C) LIBERTY (21°C) 8.5 LIBERTY (75°C) 9.5 9.0 10.0 E & C 25/9/20. | ||