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).
Specifying the minimum and maximum brush clearances for 20 HP and EAC components.
| Identifier | ExFiles\Box 50\5\ Scan380 | |
| Date | 28th September 1925 | |
| X 4333 28.9.25. D.O. BRUSH CLEARANCES. X.4610, X.8660. _____________________ 20 HP. EAC. ____ ____ Min. .005" .002" Max. .015" .009" Brush box a pressing. Brush holder a casting (slot machined). | ||