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).
From R. to H.S. regarding the successful development of quiet gears for the servo drive.
| Identifier | ExFiles\Box 182\M20\M20.1\ img055 | |
| Date | 30th June 1924 | |
| TO HS.{Lord Ernest Hives - Chair} FROM R.{Sir Henry Royce} 4 WHEEL BRAKES. I was very pleased to hear that you have succeeded in getting quiet gears for the servo drive. You have proved that it is not unsteadiness of the transmission shaft. I believe the principal advantage you have obtained is that the worm teeth have increased in obliquity and therefore have a chance of giving a smoother transmission to the worm wheel. This will argue well for our future applications of the 7 to 1 worm drive. R.{Sir Henry Royce} | ||