68
DOC.
95
APRIL
1908
closes and
opens
the hole
as soon as
the
telephone
membrane
is
excited.
Thus, pressure
fluctuations will arise
in
the
chamber, and
these fluctuations
will act
on
a
2d
(large?)
membrane
which closes the
chamber
at
another
place.
This 2d
membrane
will start to
vibrate and
will
emit
a
strong
tone
that
has
the
frequency
of
the
telephone
membrane.
Here
I
have
only
presented
the
rough
idea after
it
is
easier
to find
the variants.
1)
Must the container
receive fresh
compressed
air
over
and
over again,
which it
may
do
through
an
appropriately
chosen hole that
must be
so
large
that the
pressure
fluctuations
are
at
a
maximum.
(one
adjusts
the
hole,
say, by means
of
a
regulating
screw,
until
the
maximum effect sets
in.)
2)
could
the chamber membrane
itself
contain the
hole
into
which
the
telephone
membrane
pin enters.
One
would have to
experiment to
determine whether
this
is
advisable.
You
see,
the
idea
is
as
follows:
the
telephone
membrane
plays
the role of
a
reed
in
a
reed-pipe.
The
whole
thing
would look
something
like this:
telephone
coil
telephone magnet
telephone membrane
openings
membrane
screw
that makes
it
possible
the
entering quantity of
an
to
regulate
the cross-section
large
container
at
constant pressure
The
vessel would have
to
have
a
shape permitting
the
proper
tone to vanish
as
completely
as
possible.
But otherwise to
respond
well
to
forced
resonance, similarly
to
a
violin.
It
is
very easy
to avoid
the
reverse
action
on
the
telephone
membrane
completely,
e.g., by
constructing
the
little slide
as a
piston
valve
or a
dual
seat valve.
As it
just
occurs
tc me,
the
thing
is not
unrelated
to
the
Maschinchen.[2]
The
external
energy
source
here
is compressed
air
or
gas.
It's
a
great
pity
that
nobody
has set
to
work
on
your
Maschinchen,
but
maybe you
have
been
in too much
of
a
hurry
it will
turn out
all
right.
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