old bbc test card. This was on for much of the day, as television wasn't on until the early afternoon (no rubbishy breakfast telly to distract us from getting ready for school!) and closed down well before midnight.
Repro of 1950s KDKA-TV Test Pattern
This design was used in the 1950s by the Pittsburgh TV station in its early years under Westinghouse ownership (the station, formerly DuMont-owned WDTV, was purchased by Westinghouse in 1954 and its call letters changed in early 1955).