Dave D wrote:

snip

Not conmen, this is the way it's done, by all manufacturers AFAIK. It
stemmed from the technical identification/part number of the CRTs as they
come from the manufacturer. The diagonal size of the entire CRT formed part
of the part number.

Some manufacturers might point this discrepency out, others may not.
Personally I feel it is a bad way to measure CRTs, and misleading, but
that's not the point. For a single manufacturer to change to actual viewable
space measuring, they would have to sell larger CRTs than the competition
for the same money, while few people would probably notice the 1" or so
increase.

It would be nice if all manufacturers could agree on the change, but it
won't likely happen now- CRTs are near the end of their life.

Hi...

The OP should try this incredibly simple test. Go and get an
8 x 10 enlargement made of his favorite photograph. Take it home,
measure it, and the piece pf paper will be virtually 8 inches by 10 inches.

Now get another made, this time have it mounted in a beautiful frame.
Take that one home, measure the visible portion of the paper.
Still 8 x 10? Or is some of it covered by the matte or the frame?

Ken