Television Invented

In January 1926, the Scottish engineer John Logie Baird demonstrated a working television system to members of the Royal Institution and a journalist from The Times in his rooms in Frith Street, London. It was among the first public showings of true television: the transmission of moving images, with tonal gradations, over a distance by electrical means. The demonstration did not create the medium on its own, but it helped turn a long-running scientific puzzle into a practical technology that would reshape entertainment, news and politics in the twentieth century.

The idea of sending pictures by wire or radio had been explored for decades. In 1884 the German inventor Paul Nipkow patented a spinning disc perforated with a spiral of holes that could scan a scene line by line, and this mechanical principle underlay many early experiments. Advances in vacuum tubes, photoelectric cells and radio gave later inventors better tools. Baird, who had trained in electrical engineering in Glasgow and was often in poor health and short of money, began working on the problem in Hastings and then London in the early 1920s, building apparatus from improvised materials.

Baird's system used mechanical scanning with Nipkow discs, a light source, and a photoelectric cell to convert the image into a signal, which was then reproduced on a receiver. In 1925 he had obtained a recognizable image of a ventriloquist's dummy, often described as his first success with gradations of light and shade, and later a human face. The January 1926 demonstration showed moving images of faces at a rate of about five frames per second, with very low resolution, in a roughly 30-line picture. Observers were impressed, though the images were small, dim and flickering.

Baird moved quickly to publicize and commercialize his work. He sent a transatlantic transmission in 1928 and formed a company that sold simple receivers to hobbyists. The British Broadcasting Corporation began experimental broadcasts using his system in 1929, and in 1936 it launched a regular high-definition service in which his system and an electronic one from Marconi-EMI were used in competition. The electronic system was soon chosen, and mechanical television faded.

Baird's legacy is therefore mixed. Electronic television, built on work by figures such as Philo Farnsworth in the United States, Vladimir Zworykin and others, ultimately superseded his approach, and historians still debate how to apportion credit among the many contributors. Yet Baird was a pioneer in showing the public that television was achievable, and his persistence helped spur investment and broadcasting efforts that brought the medium into homes within little more than a decade.