The first workable device for generating electrical signals suitable for the transmission of a visual is the

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The Nipkow disc was the first workable device for generating electrical signals suitable for the transmission of a visual. It was invented by Paul Nipkow in 1884 and used a spinning disc with a series of holes in it to scan an image and convert it into electrical signals. This paved the way for the development of television technology. The cathode ray tube was later used to display the transmitted image, but it was not the first device for generating the signals. The Farnsworth connector and Baird's disc were later developments in television technology.

The First Workable Device for Generating Electrical Signals Suitable for the Transmission