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).
Request to manufacture four brass testing electrodes for laboratory use to an E.R.A. specification.
| Identifier | ExFiles\Box 61\1\ scan0173 | |
| Date | 27th March 1931 | |
| X6110 RHC.{R. H. Coverley - Production Engineer} from EFC. EFC7/AD27.3.31. X.6110. TESTING ELECTRODES. Will you please have made for electrical laboratory use, four brass electrodes as follows :- Two flat discs 3" diameter x .25" thick One cylindrical piece 1 1/4" dia. x 1 1/4" long these being to E.R.A. specification. also one cylindrical piece 1" dia. x 3" long. The sharp edges of these should be removed but in doing so the radius at the edge must not exceed .031, otherwise the flat surfaces of these electrodes should be as dead flat as possible. Received EFC. | ||