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 vs Dynamo R.P.M. from main-brush position tests on a Cushman Dynamo No. 888.
| Identifier | ExFiles\Box 51\1\ Scan149 | |
| Date | 2nd September 1927 | |
| A.207 / 2.9.27 II AMPERE OUTPUT DYNAMO R.P.M. MAIN-BRUSH POSITION TESTS STANDARD RR CUSHMAN DYNAMO NO 888 Control brush adjusted in each case to give a final temperature of from 70°C to 72°C maximum load. Final ambient temperature 21°C 13.7° CURVE 6 Brushes extended 73.5°C 10.9° " 5 " retracted 70°C 8.6° " 4 " " 72.0°C 1.7° " is 0/g° (sanctioned 73°C) Positions measured circumferentially on brush from average neutral position | ||