Page "Kinescope" Paragraph 13

After the network of coaxial cable and microwave relays carrying programs to the West Coast was completed in September 1951, CBS and NBC in 1952 instituted a " hot kinescope " process in which shows being performed in New York were transmitted west, filmed on two kinescope machines in 35 mm negative and 16 mm reversal film ( the latter for backup protection ) in Los Angeles, rushed to film processing, and then transmitted from Los Angeles three hours later for broadcast in the Pacific Time Zone.