Alexander Parkes invented the first man-made plastic (thermoplastic) in Birmingham in 1856. Arthur Leslie Large of Birmingham is credited with inventing the kettle in 1922. Princess Square, Wolverhampton, was the site of Britain's first traffic lights in 1927. Infrared cameras were developed at the Royal Radar Establishment in Malvern (with EMI Electronics) in 1967. The world's first Maglev train operated at Birmingham Airport in 1983. The tallest freestanding structure in the region is the chimney of Ironbridge power station at 673 ft. John Baskerville of Birmingham, a former stone carver, largely invented fonts, or typefaces, for printing.