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 graph showing ampere output versus RPM for a Goshawk Dynamo E at various main-brush positions.
| Identifier | ExFiles\Box 51\1\ Scan148 | |
| Date | 26th October 1933 | |
| OPERATING VOLTAGES Amps | Volts 0 | 13.5 1 | 13.6 2 | 13.75 3 | 13.9 4 | 14.05 5 | 14.15 6 | 14.25 7 | 14.35 8 | 14.45 9 | 14.55 10 | 14.65 11 | 14.75 12 | 14.85 13 | 14.95 14 | 15.05 MAIN-BRUSH POSITION TESTS STANDARD R. {Sir Henry Royce} GOSHAWK DYNAMO E Control brush adjusted on each curve to obtain a final temperature of from 78°C to 79°C at maximum load. Final ambient temperature 20°C CURVE & BRUSHES & retarded 4 | J | 78°C 3 | S | 78°C 2 | F | 78°C 1 | N | 78.5°C N | in neutral position 1st | 'advanced' | 79°C 2nd | R | 79°C Positions measured circumferentially on rocker from neutral position AMPERE OUTPUT DYNAMO R.P.M. Handwritten: X4362 I A.E.C. 26.10.33 | ||