What problems did paul nipkow have building the nipkow disk?

Answer 1

Perhaps the main problem that Nipkow had with his scanning disc is that it is suggested that he never actually made one himself. Although he patented the idea in 1876, it is known that Nipkow never made practical use of the disc. It garnered such little interest that he allowed the patent to lapse twenty years later.

John Logie Baird used the idea of the disc in the early 1920s to create the world's first working television. He used one disc for the image capture with a second disc for the display. Baird's challenge was to make sure the discs were rotating at the same speed and always staying at the same angle as each other. This problem was one of control rather than one of building the disc.