វគ្គជំនាញកុំព្យូទ័រ
ចំណេះដឹងទូទៅ
ម្ហូបអាហារ
កំប្លែង
ទស្សន៍ទាយ
small
medium
large
Phonautograph
ENGLISH MEANING
noun
1.
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
.