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).
Protecting a central piston from grit using gauze filters.
| Identifier | WestWitteringFiles\O\January1926-March1926\ Scan98 | |
| Date | 1st November 1936 | |
| (2) On further examination I cannot see how we can protect the central piston from grit, unless we get this on the past side of the filter. This suggests 2 reservoirs or 2 filters, or we chance any trouble here for the time being: everyone else does - Houdaille, etc. One thinks of putting the top joint higher and putting a gauze all over in the joint to catch the ingoing dirt. The gauze ought to be about 100 mesh each way (10,000 per sq. in.), but you should try what is practical and effective. Could we afterwards try a large gauze disc underneath, and fill from a stand pipe through it from the under side. Do not have a fussy little filter that would get left behind, or lost. R.{Sir Henry Royce} | ||