The three principal circuits used to provide a continuous source of sub-carrier in an NTSC colour receiver are briefly described. ... Describes a very sophisticated television system used at the University of California to solve the problem of lecturing to the ever ... The electron optical design of the tube yoke and focus coil combination are shove to produce zero beam landing error, excellent ... 621.397. 611 4429 A METHOD OF EDGING LETTERS SUPERIMPOSED IN TV PICTURES.