This is a useful technique for making an audio/visual presentation at
a distance. With the help of the telephone company there is a hook-up
from a speaker’s office, a meeting or classroom, where visuals can be
shown while the speaker is heard. Members of the audience can question
the speaker through a two-way hook-up. This permits the speaker to
‘appear’ at many locations without the full time or expense of going there,
and it permits remote groups to engage speakers they otherwise would not
attract.
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