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Nipkow Spiral DiskThe principle of image dissection had been one of the first steps on the way to the television. Nipkow spiral disk was the first image dissection device. Earlier, in 1873 W. Smith and J. Mayhem discovered selenium photosensitivity (inner photo effect). In 1888 A. G. Stoletov created a photo electric cell with an external photoeffect. These discoveries helped to create first systems of "remote vision". In 1878 Adriano de Paiva, a Portuguese inventor, created the first TV transmitter. The French inventor Constantin Senlecq, English electrical engineers John Perry and William Edward Airton, American employee John Carry, and Russian inventor Porfiriy Ivanovich Bakhmetiev initiated first TV projects. These projects provided for image dissection using mechanical equipment. However, Paul Nipkow, a German railwayman, made the most famous and significant contribution to the history of television. In 1884 he took out a patent for a disk with evenly spiralled small holes. If you place and rotate this disk in the photolens's focus, you will see one image point at a given moment. You'll see all image points in one rotation. As persistence is typical of a human eye (about 0.1 second), an image will be perceived as continuous provided rapid disk rotation.Scientists and engineers obtained all means required to give birth to television. They only needed an impulse to promote their creativity. And they got it. Eighteen ninety five faced radio and cinema discoveries. As they were becoming more and more widespread, and this popularity caused the equipment able to transmit images of moving objects over large distances to be developed in early 1900s.