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 Smith Oil Filter, complete with laboratory and road test results.
| Identifier | ExFiles\Box 135\3\ scan0216 | |
| Date | 27th August 1937 guessed | |
| Fig. W.1 Sump oil before fitting Smith Filter Fig. W.2. Oil from Smith Filter. Fig. W.3. Absolutely clean oil in sump which remains clean throughout life of Filter. THE SMITH OIL FILTER A description of the “Smith” Oil Filter complete with Laboratory and Road Test Report. Issued with the compliments of : S. SMITH & SONS (Motor Accessories) LTD CRICKLEWOOD . LONDON . N.W.2 The Roadcraft Press Printed in England L.P. 31 | ||