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).
The standard brushes received for a 20 HP Dynamo.
| Identifier | ExFiles\Box 50\5\ Scan338 | |
| Date | 17th July 1924 | |
| X. 4333 17.7.24. 20 HP. DYNAMO - STANDARD BRUSHES. X.4333. The following standard brushes from Le Carbone have been received to EFCl/T28.5.24, to D.50761 (Main), and D.50736 (Control). 12 Main brushes (6 sets) in L.F.C.2. grade. 12 " " (6 sets) " X grade. 6 Control brushes (6 sets) in EG.3399 grade. 6 " " (6 sets) in L.F.C.3A.B.8.grade. We have a;sp {Mr Spinney} 4 sets (8 main and 4 control) in Morganite EG.2 grade, to D.51295 (Main) and D.51294 (Control). EFC. {E. Fowler Clarke - Electrical Engineer} | ||