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 showing the output curves for a Production Lucas E 575 dynamo, plotting amperes against speed.
| Identifier | ExFiles\Box 36\4\ scan 112 | |
| Date | 5th August 1920 | |
| Prod^n. Lucas E 575. dynamo output curves. Amperes Speed brushes Normal .75°C brushes retarded .40° @ 75°C 5/8/20 X 30146 | ||