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).
The silent operation of the Smith Dynamo.
| Identifier | ExFiles\Box 61b\3\ scan0080 | |
| Date | 29th July 1920 | |
| X543 86027 Extract from R1/G29.7.20. X.295. RE SMITH DYNAMO. & SILENCE. X.543. We can well understand that this machine will be very silent, as they not only have spiral teeth, but have a gradual approach of the pole pieces, as is used on our starter motor, and by Royce Limited for over 20 years. | ||