The Challis messenger. (Challis, Idaho) 1912-current, 1924-12-10
ookup Shown Wiring Is SIM
pIicty Itself; Chances Going Arc Mnmized.

These turns should be wound in the
same direction as the secondary, and
In the center Of It. This Is very Inn.
, portant.
Procure a piece Of thin sheet brass
or copper, six inches by four. Bend
the brass or copper, as the case may
be, In the form of a circle, using the
four inches for the length, and the six
inches as the circumference. Clean
the brass where the ends meet and
with a little solder and some paste
solder them together.
You will then find that this clrcu-
lar form will fit very snugly inside OF
the coil which you prepared but few
minutes ago. Then take a piece of
brass and use 1t as a crosspiece SO
that there will be some place for a
wooden rod to control the movement
Of this metal cylinder. A piece of
dowel pin one-quafter of an inch In
diameter will serve as the shaft for
the cylinder
So much for the coil and It's contrap-
lions.
We've got to mark the panel out
so that there will be a uniform, we'll
balanced, panel layout. When doing
this, you will find 1t best to mount the
coll at the right center of the panel
SO that the shaft will project at dead
center. Then mount the rheostat q
bit below center and toward the right.
The peep holes for the tube should be
m0rkod OFF ohAun wi IL
with the shaft for the rheostat
Drill the panel carefully, feeling
your way, so that you will not burr
the panel when the drill goes through.
The best way to avoid this is to ap-
ply little pressure on the drill, and
turn 1t in a steady fashion, rather
than the jerky, spasmodic manner so
frequently practiced by the layman.
Mount the coil to the panel with
two angle brasses, and fix the rod so |
that 1t passes through the panel |
smoothly. Tighten the four-inch dial
on the rod so that by pushing 1t In
and out you will be able to control
the position Of the metal cylinder.
Wiring the Set.
The next step would be to mount
the rheostat, binding posts and the
Dashboard, upon which should be
the socket.
Now that everything is mounted, we
may proceed with the wiring of the
receiver.
Solder a piece of bus bar to the
antenna post on the set and run It to
the beginning Of the fifteen turns.
Next continue this connection to the
plate OF the vacuum tube socket Con-
1ect wire from the plate of the SOCK
It to the phone binding post as shy1sn
n Figure 1. The end of the fifteen
urns is connected to the ground bind. :
ng post and to one side of .OO1
lxed Dubilier condenser Connect the
ther side of the condenser to the
Lament minus. Run q wire from the
eginning Of the 100 turns to one side
the grid leak and condenser COM
ined. The other side of the grid con-
enser Is connected directly in as
mort and direct possible way to the
rid binding post on the socket.
Further Wiring.
Now we connect the end of the sec
ndary Goo turn winding) to the fila
lent plus. We have but few con-
ections to go. They are A wire from
lie remaining phone post to the "B"
us, a wire from the "B" minus to the
A. plus The "a" minus binding
ost goes to one side of the rheostat
e remaining terminal of which goes
one of the 'F'' posts on the sock. 4
A wire is then run from the other
r. Tost on the socket to the "An
ttery plus.
Well, the wiring of the set is done
might be wise to recheck your con-
ctions, following either the schemat-
diagram Of Figure or the picture
ok-up Of Figure 1. 2.
Undoubtedly the set will work, but 7
signals may be weak. If this he
case, the secondary leads are re-
rsed. A transposition of leads
ould settle this trouble in iiffv 1
the set bursts into oscillation too
silly, try lower and higher values TO
pass condensers from the ground
the niament minus. (The higher =
value the more 1t will oscillate) r
"hen the copper or brass ring I,
'wn inside the tube (remember II 70
connected in any electrical way).
concentrates the magnetic field Of
coil. When the ring is slid out
the surrounding field Of the coil III
distributed capacity of the Undue. VI
ce Is increased. Consequently we
able to tune the set merely bv tbs
i,ive position Of brass ring. No
oenserf of any kind are used, and
sequently the efficiency is kept near
hundred mark" Besides, Won
quite thrill when you lift up tbe .
Ell OF the set while listening ia w.