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).
Cost comparison of high tension cable from B.I. Neoprene and Johnson & Phillips.
| Identifier | ExFiles\Box 167\3\ img142 | |
| Date | 25th January 1939 | |
| -2- Rm{William Robotham - Chief Engineer}/RC.{R. Childs}8/JH.25.1.39. High tension cable for all cars. The cost of the B.I. Neoprene will be about half that of the Johnson & Phillips. Rm{William Robotham - Chief Engineer}/RC.{R. Childs} | ||