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).
Test results and comparisons of different K.L.G. spark plug models.
| Identifier | ExFiles\Box 162\2\ img005 | |
| Date | 23th February 1940 | |
| K.L.G. FLB-30X. Standard 25/30 & Bentley plug. Set on S-6-IV, 6-B-IV, 7-B-V The Corundite insulator on the K.L.G. plug is superior to the Champion Sillimanite. 1 case of misfiring on the Ripple. (1586 miles) 9000 miles on 7-B-V before misfiring. (BV) 5452 .. .. 27-G-VI .. .. .. (Wraith) FLB-30XP. Same dimensions as FLB-30X but Platinum point on earth electrode. 1 set running in transport car, to report Rm{William Robotham - Chief Engineer}/VM. 4/DT. 23-2-40 (Determining cause of misfire; oxidation of points or insulator leakage) FLB-50X. Used for PIII 12,579 miles on 35-EX; satisfactory. | ||