This method continued even when cathode ray tubes were manufactured as rounded rectangles ; it had the advantage of being a single number specifying the size, and was not confusing when the aspect ratio was universally 4: 3.

This method continued even when cathode ray tubes were manufactured as rounded rectangles ; it had the advantage of being a single number specifying the size, and was not confusing when the aspect ratio was universally 4: 3.

0.004 seconds.