Recent Technical Developments: A New Series of Engines—“Zontrol” Furnaces—Airway Beacons—Mineral Oil Test—Flexible Bearings

Bristol Mercury Engines The Bristol Aircraft Company announce the putting into production of their new series of “Mercury” engines. Although the new engines are of the same nine‐cylinder air‐cooled radial types as the Jupiter “F” the introduction of up‐to‐date features has necessitated entire re‐designing, and the new Mercury will therefore be produced side by side with the Jupiter, the two being non‐interchangeable.