New Jersey: WS of a building. Men sit at giant radio transmitters. A man adjusts knobs on the transmitter. Bulbs flash as a photograph is sent. The photograph is in a machine that rotates consistently. WS of the Rockefeller Institute for Medical Research. Dr. Vladimir Zworykin and Dr. John T. Farrar sit talking at a table. The men then go to a chalkboard that has a diagram for a circuit, Zworykin circles an element with chalk. The men use a working model. CU of the circuit in his 2 fingers. Shot of a voltage scale tipping 50 volts. The 2 men stand by the machine with an antenna. Cuts to an x-ray of an abdomen. Shot of a machine, it has a screen like that of a radar.