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).
Instrument's performance, noting a slight over-reading due to a drive speed mismatch.
| Identifier | ExFiles\Box 59\2\ Scan030 | |
| Date | 30th May 1930 | |
| EFC3/AD30.5.30 contd. -2- the working range are slightly higher in relation to the miles counted. Altogether the instrument is very satisfactorily to our requirements in itself, but will be subject to some amount of over reading due to the fact that our minimum drive speed is 750 whereas the instrument is arranged for 720. EFC. | ||