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).
Material change from steel to brass for the winding cheeks of an auto switch.
| Identifier | ExFiles\Box 59\1\ Scan217 | |
| Date | 21th December 1927 | |
| X4008 To RHC.{R. H. Coverley - Production Engineer} from EFC. c. BY/RD. EFC13/T21.12.27. AUTO SWITCH. Our original experimental model of the auto switch had brass winding cheeks, and the two you have subsequently produced for us have steel winding cheeks. We have reason to believe that brass winding cheeks give better functioning, and we should be pleased if you would arrange for the third instrument F which you are producing for us to have such cheeks. EFC. | ||