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).
Use of high conductivity copper for the Goshawk commutator and brush system.
| Identifier | ExFiles\Box 50\5\ Scan276 | |
| Date | 9th January 1924 | |
| X. 4333 To EY. from EFC. {E. Fowler Clarke - Electrical Engineer} _c._ EY/RD. EFC {E. Fowler Clarke - Electrical Engineer} 8/T9.1.24. X.4333 - GOSHAWK COMMUTATOR & BRUSH SYSTEM. I have been given to understand that when Mr. Ormerod was with us, he insisted that commutators should be produced in high conductivity copper rather than hard drawn. Presumably in any case an annealing process would be required. Admittedly, this does not follow, but there may be a quality of softer copper, causing less wear on the brushes, and if you think this is worth an experiment we should be glad if you would instruct it. At present we call for hard drawn copper on the Part Lists. EFC. {E. Fowler Clarke - Electrical Engineer} | ||