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 grind three domed battery ignition tungsten screw points flat for experimental purposes.
| Identifier | ExFiles\Box 35\6\ scan 344 | |
| Date | 21th October 1927 | |
| To HHC. from EFC. X2894 EFC/T21.10.27. TUNGSTEN CONTACT POINTS. Herewith we hand to you three battery ignition tungsten screw points which at present are provided with domed surfaces. As all our experiments are now being done on flat surfaces, will you please have these ground flat. EFC. | ||