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).
Testing F.L.B. 50.X Type Sparking plugs, finding no improvement over the F.L.B. 30.X type.
| Identifier | ExFiles\Box 162\5\ img090 | |
| Date | 17th November 1938 | |
| RC{R. Childs}/55 Please note and return Rm{William Robotham - Chief Engineer}/RC{R. Childs} To Rolls Royce Ltd. Derby........RM{William Robotham - Chief Engineer}/RC.{R. Childs} Sr/WHAT/EB.17.11.38 Re: F.L.B. 50.X Type Sparking plugs. With further reference to your RM{William Robotham - Chief Engineer}/RC.{R. Childs}9/JH7.9.38 we have now run 14.380 Kms. on chassis B-35-KU. For your information we ourselves find no improvement compaired with F.L.B. 30. X type of plug. As suggest we are sending you these plugs for your own examination. Sr/WHA. | ||