[Picture: Philo Taylor Farnsworth]Farnsworth gave the world's first public demonstration of a complete
all-electronic television system on 25 August 1934 at the Franklin Institute in Philadelphia. Other inventors had
previously demonstrated components of such a system, or had shown an electronic
system using still images or motion picture film. But Farnsworth was the first
to coordinate both electronically scanned television cameras and electronically
scanned television receivers, and present live, moving, half-tone (grayscale)
images with them. Unfortunately, his cameras needed too much light, so his work
came to a stop.