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aside
from the cost, there is another reason I think overhead projectors won't be
replaced by TV cameras or document cameras: the overhead projectors have a
much greater resolution. I love my document camera (Elmo) for many things
and use it often. It has some flexibility overhead projectors don't (for
example I teach HP calculators by putting the calculator on the Elmo), but
for fine detail diagrams I've yet to find anything as good, cheap, and
convenient as the overhead transparencies.