New-York tribune., 1922-05-21

| pfOJect through the hOto cut IN the
end of the coil tube. Thread the end
near the end of the coil tube next to
the panel, and connect this wire to
the back of the binding post ", Figs.
and 2. The wire F, Fig. 2, is now con-
nected to the back Of the binding post
q. There now remain five twisted
taps and one wire to be connected to
the six switch contacts. The taps should
be cut off about / y inches from the
coil tube, and the insulation removed
from the pairs of wires thus form ed.
Each pair of wires should be twisted
together, as shown at j., Fig 2. The
connections are now made by clamp
the single wire between the ruts and
washers on the contact bolts. The con-
nections arc clearly shown in the
diagram.
We are now ready to assemble and
wire the fixed portion of the coupler,
composed of The base b, coil support
j, panel X and coil tube P.
Screw the panel to the base and to
! the support J and insert the binding
tact bolts in the proper holes. The
switch arms should now be adjusted
SO that they make firm contact on the
! heads of the bolts Now insert four
small screws, Z, Fig. l, in the front of
the panel so that the switch arms will
rot drop of tho row of contact points
when the knobs are turned too far
Insert q wire between the nuts on the
end OF the lower switch arm bolt n
where it projects through the back of
panel X. FIG. I. Wind the wire into a
spiral OF one or two turns like clock
| spring aid connect the end to the
upper binding post which is marked
"antenna.' These connections will be
understood by referring to the upper
left-hand corner of Fig. ..
III the same manner connect another
wire from the upper switch arm boft to
| the lower binding post which is marked d
"Ground." See Fig. 2. The connecting
wires should be insulated except where
touch each other. Two short pieces of
wire are now fastened to the binding
posts III the front Of the panel, as pre-
viously explained.
The coil rube p should now be laid
on the base in about the same position
as it is shown in Fig /. The sixteen
twisted taps and also the two single
wires from the ends Of the winding
are now to be connected to the back OF
the eighteen contacts on the panel X
Scrape the cotton insulation from the
as we'll as from the ends of the two
single wire taps coming from the first
and last turns. Fasten the bare ends
OF these wires to the proper switch
contacts. BE careful not to cut or
break any OF the looped taps. The con-
Meeting wires may be fastened to the
/ switch contacts by binding them be,
tween the washer and the nut. The
order of connecting the taps may be
/ ri rot n1 t,,-r -,
Carefully raise the coil tube P again ST
the support to such a position that
when the coil tube S of the movable
section of the tuner is pushed in the
coil tube the space between the two
tubes will be equal all around. Mark
this position of the coil tube p on ]
and fasten it to j with short wooo
screws.
Wiring Condenser and Detector
The mounting Of the condenser {
and the crystal detector . on the base
r is clearly shown in Fig. ]. A wire
is run from the binding post Y on the
variable condenser C, through small
hole in the base K, and is then CON.
nected to the under side of the de.
tector binding post. Another wire is
now run from the clip which holds the
galena crystal through a small hole
in the base. and is then connected te
the under side Of the rigllt-hand bind
ing post L, The left-hand binding posi-
L is next connected to the binding
post on the variable condenser, which
has no wire attached to it, by running
a wire under the base and up through
small hole. The wiring will be
understood by referring to the right
hand portion Of Fig 2. The wires may
be the same size as were used TO,
winding the coil tubes and should be
insulated. Two pieces of wire shoule
now be connected from the binding
posts w and @, Figs. and 2, to bind
ing posts on the variable condenser
The telephone receivers are now CON
nected to the binding posts U and the
receiving set is complete. except fo>
connecting to the antenna and ground
Connect the antenna lead and groune
wire to the. binding. posts marked
"antenna" and ground" With proper
connections to antenna and ground
you are ready to operate your appa
ratus.
Directions for Operating
Push the coil tube S Secondary
about half Hsy~into-.the coil tube