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).
Letter clarifying that the angle of break may vary considerably depending on the wear of the fibre heel.
| Identifier | ExFiles\Box 65\3\ scan0152 | |
| Date | 5th January 1928 guessed | |
| -2- Contd. Your letter gives the impression that it is desirable to "maintain the angle (i.e. period of break) for a length of time", whereas we have all along been prepared to accept the fact that the angle of break may vary considerably according to the opening of the platinum gap, which depends upon the wear of the fibre heel. Yours faithfully, FOR ROLLS-ROYCE LIMITED. | ||