A collaboration of scientists allowed the development of television.  Philo. T Farnsworth and Cliff Gardiner constructed an image dissector that could take a picture apart using an electronic charge so it could be transmitted piece by piece.  The image dissector used an element called cesium which was commonly found in radio transistors.  In fact, the two inventors smashed radio transistors in order to obtain the element for their invention.  A man named Vladimir Zworykin developed the ionoscope.  The ionoscope is a pickup tube designed for an electronic camera that can be used in a studio.
    At the World Fair in New York in 1939, David Sarnoff displayed RCA's 441-line per frame resolution television, and Americans got their first glimpse of television.  When the Federal Communications Commission (FCC) adopted the black and white standard for television in 1941, the resolution standard 525 lines.  We use the same standard today.
    At first, high levels of light were used in studios to accommodate cameras.  In 1945, a device called the image orthicon tube came into use and eliminated high light levels.  In 1949 a system was made that could transmit color and lighting signals on one channel.  These developments eased the transmission and reception of television.

UD  "http://www.physics.udel.edu/~watson/scen103/99s/projects/television/tvhist2.html"
Last Updated: May 19, 1999
Created by Diana Waxman , Jessica Bureau & Greg Roeberg