It was after his nervous breakdown that he started paying attention to electronics. Marconi’s explanation about the travelling of radio waves was his area of concentration. He was almost sure that visual signals could also be transmitted through the same process. With his firm believe he started working on his project. The basic design of Baird contained a scanning disk named Nipkow disk after its German inventor, Paul Nipkow, which was developed in 1884. This device was made up of a disk made out of cardboard that had square holes in it in series, spirally placed. The Nipkow disk scanned light and dark areas when it spun with the photoelectric cell. This process converted into electrical signals. When two such disks worked in synchronization, the signals were again translated into visual images.