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 trial of different grades of dynamo brushes for the Goshawk.
| Identifier | ExFiles\Box 50\5\ Scan028 | |
| Date | 30th March 1922 | |
| X. 4333. EFC/T30.3.22. X.4333 - GOSHAWK DYNAMO BRUSHES. We have today received from the Morganite Co. seven brushes to D.50301 in their Link C.M. 5 quality. We therefore now have for trial on the Goshawk dynamos, the following grades :- Le Carbone C.G.3. " " X " " O (or Z) Morganite E.G.O. " H.M.6. " C.M.3. [strikethrough] " C.M.5. Dynamo No.1 fitted to 4 Gos.II (R's car) has brushes of grade O or Z (?) No.2. Dynamo fitted to 5 Gos.II (Hy{Tom Haldenby - Plant Engineer}'s trials car) is fitted with C.G.3 brushes. ? Dynamo No.3. fitted to 6 Gos.II (second trials car) is fitted with C.G.3 main brushes and E.G.O. control brush. Dynamo No.4 which was received by us fitted with grade X brushes will be fitted with whichever is found to be most suitable of the X, H.M.6 & C.M.5 grades. EFC EFC. | ||