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).
Photomicrograph comparison of foreign matter passed through a standard gauze filter versus a Zenith filter.
| Identifier | WestWitteringFiles\Q\February1927-March1927\ 60 | |
| Date | 5th April 1923 | |
| N.B. The % of fluff is the only point to be noted. The grit passing the Zenith filter is so fine that it coagulates into lumps. [Left Card] R.R 403 (S H) (S H 839, 31-12-20) G 2964 ROLLS-ROYCE LTD. LABORATORY. PHOTOMICROGRAPH No. A817. MAGNIFICATION: 10 DIAMETERS. COMPARATIVE RESULTS OBTAINED BY PASSING THE SAME MIXTURE THROUGH STD: GAUZE AND THEN 'ZENITH' FILTER. C. SHEWING % OF FLUFF IN FOREIGN MATTER PASSING STD: GAUZE. [Right Card] R.R. 403 5 M.{Mr Moon / Mr Moore} 'B.K. 724, 5-4-23) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 3239. ROLLS-ROYCE LTD. LABORATORY. PHOTOMICROGRAPH No. A816. MAGNIFICATION: 10 DIAMETERS. COMPARATIVE RESULTS ETC: D.{John DeLooze - Company Secretary} SHEWING. % OF FLUFF. IN. FOREIGN. MATTER. PASSING. ZENITH. FILTER. | ||