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).
Promotional leaflet for Swiss-made Deltavis spark plugs, valves, whistles, and precision screw parts.
| Identifier | ExFiles\Box 33\3\ Scan217 | |
| Date | 13th July 1922 guessed | |
| Panel 1: SPARKING PLUGS "DELTAVIS" (Made in Switzerland) Two models which can be used for most cars. (Special models for motor cycles, small cars, Buick, Nash and Franklin, Overland, Fordson Tractors, etc. can also be supplied). 18 m/m metric thread. Copy of Certificate given by "AGIS" SOCIETE ACADEMIQUE D'AVIATION AT ZURICH " 'Your Sparking Plugs 'Deltavis' have been tested on Motosacoche H.P. with excessive pressure, on Motor 185 H.P. with high pressure, and on Motor 100 H.P. with normal pressure.' 'In spite of excessive abundance of oil and in spite of the inclined position, your plugs have not oiled up. Whereas other plugs had to be cleaned after 2-3 hours running, a fact which made a number of other plugs useless for our purposes, it was found that 'Deltavis' Plugs could be employed during five weeks without it becoming necessary to clean or to change them. (Actual flying time, eight hours).' 'After testing, we found that the 12 'Deltavis' Plugs were quite clean. The insulating parts and the body showed a very thin coat of soot, whereas the electrodes remained quite free from any deposit. On the 100 H.P. Motor after a flight of four hours, your plugs remained quite clean.' 'This is a record which no other plugs tested by us have ever achieved.' " VALVE AND WHISTLE. Whistle and Compression Tap combined. Neatest and most reliable Whistle, combined with Compression Tap, having all the advantages of the best of its kind. The only Whistle permitting infusion of petrol at any time without unscrewing. Compression Tap of simplest and most efficient type Selling Agents wanted everywhere. C. MEIER-MATTES & Co., Cannon Street Buildings, E.C.4 Panel 2: Switzerland has been leading for precision and workmanship ever since the watch industry was born there. Part of the interior of Switzerland's foremost screw works, Deltavis Co., Soleure. Sole Agents C. MEIER-MATTES & Co., Cannon Street Buildings, E.C.4. Telephone: City 3376. Telegrams: Deltavis, London. Panel 3: DELTAVIS SCREW-WORKS SWITZERLAND for quick deliveries of large lines of precision parts and repetition work for all industries Apply for samples and offers to: C. MEIER-MATTES & CO., LONDON, E.C.4. CANNON STREET BUILDINGS. Telephone: City 3376. Telegrams: Deltavis, London. Partners: C. Meier-Mattes, Swiss; U. Bretscher, Swiss. | ||