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).
Dynamo brushes wearing down due to a thick black gummy deposit.
| Identifier | ExFiles\Box 166\1\ img100 | |
| Date | 11th April 1937 | |
| 6093 HOTEL DE FRANCE. CHATEAUROUX. Indre. FRANCE. : WST Rm{William Robotham - Chief Engineer}/GWH{George W. Hancock - Head Chateauroux}/IMW{Ivan M. Waller - Head of Chateauroux}/6/JAB. 11th April 1937. To. Rm.{William Robotham - Chief Engineer} c. Rm{William Robotham - Chief Engineer}/Wst. c. Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} 6. B. IV. DYNAMO BRUSHES. Replying to your memo Rm{William Robotham - Chief Engineer}/Wst.3/AP.9.4.37, the dynamo commutator is not oily, but becomes coated with a thick black gummy deposit off the brushes. This also gets on the sides of the brushes and makes them sticky. They have worn down badly. ---------- CAP. Rm{William Robotham - Chief Engineer}/GWH{George W. Hancock - Head Chateauroux}/IMW.{Ivan M. Waller - Head of Chateauroux} | ||