Radiola
III
other
object
than
the
antenna
insulators.
The
same precautions
apply
to
the
lead-in, which should preferably be a continuation of
the
antenna
wire
to
eliminate joints,
and
should
run
as directly as pos-
sible
to
the
receiver.
The
antenna
should be
at
right
angles
to
any
electric light
and
other
wires
and
if practicable,
at
least
15
feet
distant
from
them
and
from
other
antennae.
It
should
be
erected
in a
strong
and
durable
manner
in accordance
with
the
require-
ments
of
the
National
Electric Code.
Indoor
Type-For
local reception,
and
in some cases for dis-
tant
reception, satisfactory results
may
be
secured
by
using
20
to
40 feet of
ordinary
cotton
covered
magnet
or
bell wire
(about
18
to
22
B & S gauge)
strung
around
a picture moulding
or
else-
where
as
high
up
as
possible.
This
type
of
antenna
is particularly
suitable for use in
apartment
houses
or
similar buildings
but
will
not
give satisfactory results
in
steel frame buildings
or
in
ones
having
metal
lath
under
the
plaster.
Ground
A good ground is
as
necessary
as
a good
antenna.
The
best
ground is a good electrical connection
to
a
water
pipe.
If
this
is
not
convenient, a connection
to
the
steam
or
hot
water
heating
system
will usually serve almost
as
well. Connections
to
gas pipes
should
be
avoided.
If
nothing
of
this
nature
is available, a pipe
or
metal
rod
may
be
driven
into
the
ground
to
a
depth
of several
feet, preferably where
the
soil is moist.
The
ground connection
should
be
made
with
a ground clamp
to
which
the
wire is soldered
or
securely held
by
gripping
under
a screw
or
nut.
In
any
case
the
pipe
must
be
scraped
or
filed
until
clean
and
bright
before
attach-
ing
the
ground
clamp. Usually, connecting
to
more
than
one
ground, for instance,
to
both
water
and
steam
pipes, will improve
reception.
Connections
Three
separate
batteries
are
needed
to
operate
Radiola
III.
The
"A"
battery
heats
the
filament of
the
Radiotrons,
the
"B"
battery
supplies
the
power
to
the
plate
circuits
and
the
"C"
battery
controls
the
grid
potential
of
the
amplifier
Radiotron
so
that
ampli-
fication will
be
undistorted
and
the
"B"
battery
will
last
longer.
5
Radiola
III
other
object
than
the
antenna
insulators.
The
same precautions
apply
to
the
lead-in, which should preferably be a continuation of
the
antenna
wire
to
eliminate joints,
and
should
run
as directly as pos-
sible
to
the
receiver.
The
antenna
should be
at
right
angles
to
any
electric light
and
other
wires
and
if practicable,
at
least
15
feet
distant
from
them
and
from
other
antennae.
It
should
be
erected
in a
strong
and
durable
manner
in accordance
with
the
require-
ments
of
the
National
Electric Code.
Indoor
Type-For
local reception,
and
in some cases for dis-
tant
reception, satisfactory results
may
be
secured
by
using
20
to
40 feet of
ordinary
cotton
covered
magnet
or
bell wire
(about
18
to
22
B & S gauge)
strung
around
a picture moulding
or
else-
where
as
high
up
as
possible.
This
type
of
antenna
is particularly
suitable for use in
apartment
houses
or
similar buildings
but
will
not
give satisfactory results
in
steel frame buildings
or
in
ones
having
metal
lath
under
the
plaster.
Ground
A good ground is
as
necessary
as
a good
antenna.
The
best
ground is a good electrical connection
to
a
water
pipe.
If
this
is
not
convenient, a connection
to
the
steam
or
hot
water
heating
system
will usually serve almost
as
well. Connections
to
gas pipes
should
be
avoided.
If
nothing
of
this
nature
is available, a pipe
or
metal
rod
may
be
driven
into
the
ground
to
a
depth
of several
feet, preferably where
the
soil is moist.
The
ground connection
should
be
made
with
a ground clamp
to
which
the
wire is soldered
or
securely held
by
gripping
under
a screw
or
nut.
In
any
case
the
pipe
must
be
scraped
or
filed
until
clean
and
bright
before
attach-
ing
the
ground
clamp. Usually, connecting
to
more
than
one
ground, for instance,
to
both
water
and
steam
pipes, will improve
reception.
Connections
Three
separate
batteries
are
needed
to
operate
Radiola
III.
The
"A"
battery
heats
the
filament of
the
Radiotrons,
the
"B"
battery
supplies
the
power
to
the
plate
circuits
and
the
"C"
battery
controls
the
grid
potential
of
the
amplifier
Radiotron
so
that
ampli-
fication will
be
undistorted
and
the
"B"
battery
will
last
longer.
5
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