VISUAL DESCRIPTION
This is a vintage advertisement featuring the iconic Big Ben clock tower in London, with clouds or smoke swirling around it. The ad text reads "Time Marches On" and highlights the progression of ROTOL's variable pitch airscrew (propeller) technology from 1937 to 1941. Each year marks a significant development for ROTOL, starting with their collaboration with Rolls-Royce Limited and the Bristol Aeroplane Company in 1937, leading up to advancements such as hydraulic variable pitch airscrews fitted to British frontline fighters and bombers by 1940. By 1941, they introduced an electrically controlled version. At the bottom of the ad is a bold statement: "There is a ROTOL VARIABLE PITCH AIRSCREW to suit the many requirements of all high-performance aircraft. "

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