Philo T. Farnsworth image dissector display, 1941

The image dissector is a video camera tube in which photocathode emissions create an electron image. Philo T. Farnsworth first submitted a patent application for the image dissector on January 7, 1927. Farnsworth transmitted its first image, a simple straight line, in his small loft at 202 Green Street, San Francisco, the following September. By September 3, 1928, Farnsworth was able to demonstrate the first fully electronic television system. This is a 1941 version of that tube.