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).
Micro-examination report detailing measurements of gaps in a Zenith petrol filter.
| Identifier | ExFiles\Box 44\1\ Scan276 | |
| Date | 24th January 1929 | |
| Micro-Examination Report. X3700 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} H12/EA24.1.29. M641. Laboratory. Re Zenith Petrol Filter. (Further to our report No. M640.). We have measured the second Zenith filter submitted yesterday, with the following results :- Average width of gaps between ten pairs of plates -- 0.0026" Width of largest gap measured ----------- 0.0052" Width of smallest gap measured ----------- 0.0017" Filter returned herewith. Hl. He | ||