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Webster's 1913 Dictionary
PHONAUTOGRAPH
Pho
*nau "
to
*
graph,
n.
Etym:
[
Phono-
+
Gr.
-
graph.
] (
Physics
)
Defn:
An
instrument
by
means
of
which
a
sound
can
be
made
to
produce
a
visible
trace
or
record
of
itself.
It
consists
essentially
of
a
resonant
vessel,
usually
of
paraboloidal
form,
closed
at
one
end
by
a
flexible
membrane.
A
stylus
attached
to
some
point
of
the
membrane
records
the
movements
of
the
latter,
as
it
vibrates,
upon
a
moving
cylinder
or
plate.
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