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 open circuit volt-speed curves for various plain shunt wound dynamos under cold and hot conditions.
| Identifier | ExFiles\Box 37\2\ scan 103 | |
| Date | 22th September 1920 | |
| OPEN CIRCUIT VOLT-SPEED CURVES OF PLAIN SHUNT WOUND DYNAMOS FOR COLD AND HOT CONDITIONS I. Table: Dynamo, Balancing Speed Cold Hot Range BOSCH 370 406 36 SMITH 2D 390 460 70 SMITH A 419 501 82 BIJUR 515 599 84 (Vertically alongside table) ALL TWO POLE Graph Axis: Y-Axis: E.M.F. (VOLTS) X-Axis: DYNAMO SPEED (R.P.M.) Graph Lines (from left to right): SMITH 2D (20°C) SMITH 2D (84°C) BOSCH 19°C BOSCH (79°C) SMITH A (24°C) SMITH A (83°C) BIJUR (19°C) BIJUR (70°C) LIBERTY (21°C) LIBERTY (76°C) Notes: Top Right Note: 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. Bottom Right Note: The Liberty being an 8 volt dynamo the voltages shown by the curves are 2/3 of those indicated by the scales. Other text: 13.6 VOLTS 12.4 VOLTS | ||