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).
Constructing a special thermo-couple with a cast iron element and testing its electromotive force.
| Identifier | ExFiles\Box 76\3\ scan0130 | |
| Date | 24th February 1926 | |
| X771 Hs{Lord Ernest Hives - Chair}/Mr.Robotham. H15/EA24.2.26. Laboratory. Re Special Thermo-couple with one element of cast iron - for use at a maximum temperature of 700°C. A couple suited to your purpose can be made with "Eureka" resistance wire, which can be obtained from the electricians' stores. Tests carried out at a temperature of 750°C with a couple 15" long made from 18 gauge wire spot welded to a 5/16" rod of cast iron gave an E.M.F. of 38 millivolts. H1/EJW [Signature EJW] | ||