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).
Data on the average life and service mileage of spark plugs for the 25/30 and Bentley 4¼ models.
| Identifier | ExFiles\Box 131\2\ scan0098 | |
| Date | 3rd December 1937 | |
| W/K.{Mr Kilner} To Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} from Rm{William Robotham - Chief Engineer}/W.Brazier. 1113 Rm{William Robotham - Chief Engineer}/W.Brazier.6/MH.{M. Huckerby}3.12.37. We are trying to obtain a figure for the average life of a sparking plug and the amount of service necessary, i.e. cleaning and setting of spark gaps and at what mileage. Could you, from your records give us this information please, both for the 25/30 and the Bentley 4¼, also if you consider the life of the (K.L.G.831 25/30 H.P.) and (K.L.G.850 Bentley) was better than the present K.L.G. F.L.B. 30.X. Rm{William Robotham - Chief Engineer}/W.Brazier. | ||