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 merits of externally-cleanable oil filters, referencing Zenith, Enots and Auto Klean types.
| Identifier | ExFiles\Box 44\1\ Scan300 | |
| Date | 22th April 1929 guessed | |
| contd :- -2- the Zenith or the Enots. For an oil sump however where the filter is inaccessible it would appear to be a marked asset to be able to restore the filter to 90% cleanliness by turning the handle on the outside of the crankcase. We have seen a very neat Scheme of Auto Klean filter incorporated in the Crankcase of a 20HP Sunbeam. HS{Lord Ernest Hives - Chair}/RM.{William Robotham - Chief Engineer} | ||