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).
Description of a speedometer and mileometer arrangement using an alternator, rectifier, and synchronous motor.
| Identifier | ExFiles\Box 165\4\ img063 | |
| Date | 20th May 1930 | |
| EFC2/AD20.5.30 contd. -3- There appears no reason in principle why a practical arrangement of speedometer and mileometer should not consist of an alternator whose rotating element is either a permanent magnet or an inductor, the fixed windings being permanently connected to a pair of line wires which supply a rectifier type instrument for speed indication, and a small synchronous motor driving a counter for mile indication. EFC. | ||