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).
Performance specifications for a 20 HP 48 coil intermediate output dynamo.
| Identifier | ExFiles\Box 165\6\ img255 | |
| Date | 30th December 1929 | |
| X 6003 30.12.29. X6003 X.5664 20 HP. 48 COIL INTERMEDIATE OUTPUT DYNAMO. Cutting in point 15% above standard. Peak output 22% higher than " High speed output 1 to 1 1/2 amperes higher than standard. | ||