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).
Note on testing the polarity of experimental and standard production coils.
| Identifier | ExFiles\Box 164\5\ img306 | |
| Date | 1st October 1937 | |
| -2- Rm{William Robotham - Chief Engineer}/RC.{R. Childs}9/AP.1.10.37. The R.R. coil was made before the alteration was instructed. All experimental coils will be tested for polarity and marked accordingly, as soon as possible. We have tested a standard production coil with regard to this polarity and find same correct. Rm{William Robotham - Chief Engineer}/RC.{R. Childs} | ||