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Webster's 1913 Dictionary
COPYGRAPH
COPYGRAPH
Cop
"y *
graph,
n.
Defn: A
contrivance
for
producing
manifold
copies
of
a
writing
or
drawing.
Note:
The
writing
or
drawing
is
made
with
aniline
ink
on
paper,
and
a
reverse
copy
transferred
by
pressure
to
a
slab
of
gelatin
softened
with
glycerin.
A
large
number
of
transcripts
can
be
taken
while
the
ink
is
fresh.
Various
names
have
been
given
to
the
process
[
the
gelatin
copying
process
],
some
of
them
acceptable
and
others
absurd;
hectograph,
polygraph,
copygraph,
lithogram,
etc.
Knight.
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