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).
Modified Zenith petrol filter, its production status, weight, and potential material changes.
| Identifier | ExFiles\Box 44\1\ Scan167 | |
| Date | 10th August 1927 | |
| To BY/C. from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Y/S700 Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}9/LG10.8.27. ZENITH PETROL FILTER. With reference to the attached. We were supplied with a petrol filter having a modified stirrup and clip otherwise exactly the same as standard. We think this is an improvement but shall not bring it on to production until it has done further mileage. At present we conclude that you are ordering the filter which we originally shewed to you and which we decided would be a standard sample. We still think the filter is too heavy but the Zenith people have so far been unable to find a satisfactory alloy for the head. If the latter was designed so that it did not have to take the working screw thread, duralumin could obviously be employed. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||