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Modern Magic: A Practical Treatise on the Art of Conjuring
·
Professor Hoffmann
692
Both
the
apertures
were
guarded
by
leather,
to
prevent
unnecessary
waste
of
air:
two
smaller
air-chests
were
then
put
into
it,
each
having
a
valve
above
closed
by
the
pressure
of
a
spring,
and
each
having
a
round
aperture
adapted
to
receive
through
the
side
of
the
large
air-chest
a
tin
funnel,
and
a
round
wooden
tube
for
producing
hissing
sounds--as,
s,
z,
sch,
j.
The
voice-pipe
was
placed
in
the
large
air-chest,
so
as
to
be
between
the
smaller
air-chests.
When
all
these
parts
were
fitted
to
the
air-chest,
the
operation
of
one
lever
raising
the
valve
of
the
first
smaller
chest
connected
with
the
tin
funnel
produced
the
sound
s;
while
the
operation
of
another,
raising
the
valve
of
the
second
smaller
chest
connected
with
the
wooden
tube,
produced
the
sound
of
sch.
But
it
is
proper
further
to
explain
that
instead
of
being
a
simple
tunnel,
it
was,
in
fact,
a
tin
box,
with
a
square
hole
in
the
outer
end,
nearly
covered
by
a
slip
of
pasteboard;
and
the
wooden
tube
was
merely
the
mouth-piece
of
a
common
flute,
closed
at
the
lower
extremity,
and
with
the
air-hole
modified
and
contracted:
the
letter
r
was
produced
by
the
rapid
vibration
of
the
ivory
slip,
owing
to
a
strong
discharge
of
air.
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