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).
Order for experimental dynamo brushes of different grades for a new 72 coil dynamo.
| Identifier | ExFiles\Box 166\1\ img116 | |
| Date | 9th December 1938 | |
| To Roy{Sir Henry Royce}/Ms. c.c. to Rc{R. Childs}/CAP. 6093. Rm{William Robotham - Chief Engineer}/RC.{R. Childs}4/JH.9.12.38. Dynamo Experimental Brushes. With the introduction of the new dynamo, having 72 coils it is considered that fresh attempts should be made to use the harder grades of brush. Will you therefore please order from the Morgan Crucible Co. for experimental purposes :- 4 sets (eight brushes) of brushes to D.7574 but in EG3 grade material. 2 sets (four brushes) of brushes to D.7574 but in HM{Capt. W. Hallam - Head Repairs}7635 grade material. O/N.52444. Rm{William Robotham - Chief Engineer}/RC.{R. Childs} | ||