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).
Diagram illustrating the brush settings for an E.d.C. motor, showing various leading angles.
| Identifier | ExFiles\Box 64\1\ scan0206 | |
| Date | 26th May 1925 | |
| X.7620 26-5-25 terminal leading by 4.4° 10.1 segs leading by 6.4° Brushes 6° advanced. (average) leading by 4.4° 10.0 segs leading by 7.8° Brush settings of E.d.C. motor (c). S.J. | ||