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Progressive scanning (alternatively referred to as noninterlaced scanning) is a way of displaying, storing or transmitting moving images in which all the lines of each frame are drawn in sequence. This is in contrast to interlaced video used in traditional analog television systems where only the odd lines, then the even lines of each frame (each image called a video field) are drawn alternately. The system was originally known as "sequential scanning" when it was used in the Baird 240 line television transmissions from Alexandra Palace, the United Kingdom in 1936. It was also used in Baird's experimental transmissions using 30 lines in the 1920s. Progressive scanning is universally used in computing.