Test Card B
Test Card B was an early BBC television test card. It was very similar to Test Card A but was never broadcast. The original card has since gone missing. The only difference was it had an extra greyscale stripe below the circle. The letter box in Test Card A was moved to the top of the card. This card was never broadcast, possibly used for by BBC engineers for internal use. Below is a reconstruction of Test Card B using a studio picture of a partial Test Card B.
Read more about this topic: List Of BBC Test Cards
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