Test pattern?

[W.B.]

Originally Posted by jr_tech

I believe that they define the resolution scale in various parts of the "wedges" from 200 to 450 lines in the center and 200 to 350 at the corners

NBC, oddly enough, had a layout of their famed "bullseye" pattern in which they explained what the significance of the wedge calibration dots as positioned on each side of their horizontal and vertical wedges, were:



Alas, I haven't heard, seen or read anything about this variation being seen on the air.

NOTE: 200 TV lines = 2.5 MHz (or "mc," as it was known as of 1947).