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).
Table comparing flow rates in pints per hour for standard and modified filters under two different conditions.
| Identifier | WestWitteringFiles\T\2July1929-December1929\ Scan129 | |
| Date | 7th November 1929 | |
| Hs{Lord Ernest Hives - Chair}/Rn{Mr Robinson}2/AD7.11.29 contd. -4- | | Standard filter | Modified filter | |---|---|---| | Flow from banjo condition (2) | 97.5 pts/hr. | 110 pts/hr. | | Flow through needle valve condition (7) | 75 pts/hr. | 78.7 pts/hr. | Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||