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).
Continued note on instrument readings for mileage and speed based on tyre revolutions per mile.
| Identifier | ExFiles\Box 59\2\ Scan083 | |
| Date | 3rd October 1930 | |
| EFC2/ADL3.10.30 contd. -2- the mileage reading will be about 2% high and the miles per hour reading will be a little bit higher than this to an extent which will probably be considered reasonable. It will be remembered that in our EFC2/AD3.9.30 we advocated instruments arranged for 794 revolutions per mile in view of the fact that the 800 revolutions per mile of the drive corresponds to the smallest tyres used and not to the average case. EFC. | ||