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).
Patent specification for a sparking plug, noting the design has been abandoned.
| Identifier | ExFiles\Box 162\3\ img168 | |
| Date | 19th February 1940 | |
| Elec. 6000 To NW.{N. Walker - Patents} Rm{William Robotham - Chief Engineer}/RC.{R. Childs}9/ML.19.2.40. re Patent Specification for Sparking Plug. Herewith Photostat of specification No: 16256/39. also copy of 500148 which you kindly obtained for our perusal. We find that this scheme has been abandoned by at least one firm for an improved scheme employing a special compensating washer. Rm{William Robotham - Chief Engineer}/RC.{R. Childs} | ||