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5.
7 0
SELENIUM
RECTIFIER
81
_ =-=-
=
_
e ectromagnet
which
causes
a steel
-
::·oie
and produce sound.
Whe
n
_
=-=·;:·:
ed,
th
e
stee
l
core
is drawn
in,
at
·-=
-~
--=
::·ea ks
the
contact which opens the
:- :
·=-
·
::~d
causes
deenergizing
of
the coi
l.
--=
:-ee
core
is
conn
ected to the
r
esonator plate
:::-::
:::.:es
i.
to
vib
rate
,
producing the
so·und.
--e
·rouble
symptoms
of
th
e
ho
rn
are,
no
sound
::·::::
ced,
w
eak so und,
poor quality
o
f
tone
.
Perform
··e
·
.spection
in
the
fol lowing
manner.
If
th
e
horn
does
not
produce a
ny
sound,
first
check
to see if
the
fuse
is
bl
own
.
(Fig.
5-34)
2
Wh
en
checking
any
defect condition,
co
nnect the
horn
directly
t
o
the
battery
w ith seperate leads.
o.
Proper
sounding
w
ill
indi
cate
a
defective
horn
switch.
b.
When
t
he
sound
is
weak, adjust the
sc
rew
at
the
back of
the horn.
(Fig.
5-
35)
Turn the screw
t
o
th
e right
t
o
de crease
the
sound.
Tut
n
the
screw
to th
e left
to
inc rease
the
sound.
31
H
o rn
p
roduces
a
sound
of poor quali
ty.
Remove
the
ho
rn a nd
check for
poor
point
con-
tacts,
rem
ove
th
e
wires
at th
e
terminals and
measure
the resistance
of
the
coi
l.
The resistance
sho
uld
be
appr
oximately
1
fl.
Battery
Installation
I
1 I
W hen
installing a
fully charged batte ry,
clean
the exterior
tho
ro
ughly
w ith water.
1
21
Apply a
coating
of
grease
o
r
vaseline
a
ft
er
connecting
th
e leads to
the
batt
ery
t
erminals
t
o
pr event
corrosio
n.
131
Make su
r
e that t he
EB
and
e
connecti
o
ns are
pro
perly
made.
5.1
0
SELENIUM RECTIFIER
The
function
of
the
rectifier
is
t
o
convert
A.C.
to
D.C. and
is
used
o
n
all
A.C. generator
o
r A.C.
generating
coil.
It utilizes
the
phenomena
of
a
ll
owing
the
cu rrent
to
now in one
dir ecti
on
and permitting
only
a
small
amount
o
f current to
now in the
r
eve
rse
direction.
The
construction of
the
rectifier
is sho
wn
in
Fig. 5.36
w
ith
a
mo
isture-proof
paint
applied.
(Fig.
5-
36)
The
electro
d
e
a lloy
side, co
mpar
ed
to the
op-
posit
e
side havi ng a
st
ee
l
pla
t
e,
is
rai
sed
appro-
ximately
1
mm 10.040
in ch)
making
it
easy
t
o
r ecogni zed
even
w
ith
the
surface
paint ed.
The C50M, C65M are
equipped
with
a
f
ull
wave rectifier,
whereas,
th
e
C50,
C 65,
S50,
S65
ore
eq uipped wit
h
half
wove
recti
fi ers.
'
adjusting
Figure
5-
35.
Ad
justing
the
horn
Dielectric
coating
r
~r~
z ~z~?~2~?:~~~~
z
~
z
~
?:
~>~~7.~
..
~
_ ,
~
'
~
'
~~~~E
;~~
~
:
~i~~ct
r ode
S
tee
I plate
r
ormal
lira:
·:·:
:
ea:~ ·c
resistivity
Re ;rsairc:: •
·
:
- =' "
e.ec
·c
resistivity
Figure
5-
36.
Selenium
rectifier construc
ti
on
diagram
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