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).
Suggestion to restrict flow through the Phantom III valve gear filter using an orifice.
| Identifier | ExFiles\Box 96\2\ scan0228 | |
| Date | 21th May 1937 | |
| Files F.Dooo Comments Rm.{William Robotham - Chief Engineer} Rm{William Robotham - Chief Engineer} c. Hs.{Lord Ernest Hives - Chair} Mx.{John H Maddocks - Chief Proving Officer} Rm{William Robotham - Chief Engineer}/FD.{Frank Dodd - Bodies} 354 E.6/HP.21.5.37. Phantom III Valve Gear. This is to confirm my suggestion to try restricting the flow through the valve gear filter on Phantom III by an orifice on the inlet side, with the object of preventing this filter stopping up less rapidly. This orifice would not prevent the full pressure of the oil supply being available when the filter did eventually begin to become clogged. 33Ex. E.{Mr Elliott - Chief Engineer} [Signature] | ||