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).
The advantages of the Zenith filter, which has been standardised on the 20 HP model.
| Identifier | ExFiles\Box 44\1\ Scan195 | |
| Date | 17th May 1928 | |
| To B.J. from Hs.{Lord Ernest Hives - Chair} V3700 Hsl/LG17.5.28. ZENITH FILTER. We attach herewith photographs which illustrate the advantage of the Zenith filter over the present standard. The Zenith filter has been standardised on the 20 HP. for some time and we certainly appear to have had fewer complaints since its adoption. From our experience the Zenith filter will stop a reasonable amount of water, at least it is more effective than the present one in this respect. Standardisation sheet returned herewith. Hs.{Lord Ernest Hives - Chair} Kindly return photograph for file. | ||