The 12.8 Litre Argyll sleeve-valve aero engine was first prototyped in 1914, this is the first image of the engine on the test-stand before it was sent to London for the Olympia Show held from mid-to-late March of the same year. Sleeve valves were being experimented with at the time and that man on the right, Peter Burt, held a number of patents for them.
Read more about this engine and sleeve-valve engines here via EngineHistory.org
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