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).
Laboratory report with two photomicrographs comparing foreign matter passing through different filters.
| Identifier | ExFiles\Box 44\1\ Scan115 | |
| 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. X4037 [Left Card] R.R. 403 (S.H) [S.H. 839, 31-12-20] G 2964 ROLLS-ROYCE LTD. LABORATORY. PHOTOMICROGRAPH No. A517. MAGNIFICATION: 10 DIAMETERS. COMPARATIVE RESULTS OBTAINED BY PASSING THE SAME MIXTURE THROUGH STANDARD GAUZE AND THEN 'ZENITH' FILTER. C. SHEWING % OF FLUFF IN FOREIGN MATTER PASSING STANDARD GAUZE. [Right Card] R.R. 403 S.H. [S.K. 724, 5-4-23] G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 3239. ROLLS-ROYCE LTD. LABORATORY. PHOTOMICROGRAPH No. A516. MAGNIFICATION: 10 DIAMETERS. COMPARATIVE RESULTS ETC: D.{John DeLooze - Company Secretary} SHEWING % OF FLUFF IN FOREIGN MATTER PASSING FILTER. | ||