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).
Technical note on the performance and disadvantages of European and American Zenith Gravity Filters.
| Identifier | ExFiles\Box 44\1\ Scan245 | |
| Date | 19th October 1928 | |
| OY3.R.10.19.28 October 19th, 1928. C. European and American Zenith Gravity Filters. Do not appear to air lock even when there are loops in the fuel line. Appear equally good. Disadvantage is the "flooded" joint of the glass bowl introducing danger of leakage, and lack of protection to parts in vac. tank making strainer still necessary in gas tank. This is the form used by England - mounted on rear tappet cover to avoid loops in the fuel line. OY. Maurice Olly COPY | ||