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).
List of various grades of brushes for testing, including standard narrow and 20 HP twin types.
| Identifier | ExFiles\Box 165\6\ img177 | |
| Date | 19th September 1928 | |
| . X5670 EFC/T19.9.28. X8673 BRUSHES OF VARIOUS GRADES FOR FOSSIBLE TEST. (Std. narrow brushes). Le Carbone. EGA. Main and control. 1 set. EG.3417. Main and control. 1 set (awaiting road test) LFC.3AB8. Main only. MORGANITE. * EG2. Main and control. 2 sets. EGO. " " " EG.6630. " " " (Awaiting road test). A.5670 20 H.P. TWIN TYPE BRUSHES. LE CARBONE. LFC.2. Main, LFC.3AB8 Control. 1 set. X Main, EG3399 Control. 1 set. MORGANITE. EG2. Main and control. 1 set. EFC. | ||