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 different grades of sheet material and faulty short type ignition coils.
| Identifier | ExFiles\Box 69\1\ scan0038 | |
| Date | 18th September 1926 guessed | |
| -4- Of the sheet material, the brown grades in every case were bad, while the best results were obtained with the yellow linen-based material and the Mosses & Mitchell grade "O" after heating and cooling. Some of the original faulty short type ignition coils are being tried for ignition characteristics on the bench at temperature, and if these now still shew the original characteristics they will also be re-tested in the above manner. EFC. | ||