The Washington herald., 1911-10-01

Purchase from some electrical store a
half pound of No. IS single cotton COW
cred magnet wire. Then purchase card
board tube twelve inches long and one
and one-half inches in diameter. On this
tube wind your wire. being sure to put
shellac on the tube before winding. Next
get a piece of brass twelve inches long
and 4 quarter of an inch in diameter;
this will be the rod for the slider. Next
get a piece of wood one inch by seven
eighths by fve-eighths Through the
centre lengthwise bore a hole one-quarter
of an inch in diameter, so that the roc
can fit in it. Next get a piece of brass
about two inches by one-quarter by one
sixteenth inch this would best be sprins
brass. Bore two holes in this piece Of
brass, the t a quarter of an inch from
one end, the other a quarter of an inch
away from the first hole. These tive
holes . bored so You can screw it on
the block of wood. Under ore of these
screws put a piece of wire about fifteen
inches long. like No. I. Now bend the
brass ike No. .. so that it can be used
to slide along the wire.
Get two pieces of wood three-quarters
of an inch by three inches by three inches
These are for the end of the coil.
Bring one end of the coil out to a bind
ing post on one of the ends, the other
end thrust inside the coil. Take the wire
from the slider and put that on binding
Si1 NJ he
that put the ends on. Then take a hot
iron or poker and burn the insulation
Of the coil about 4 half inch wide. Then
sandpaper that part. Now place your
slider and rod over this bare space on
the tuner, and then tack the rod down to
the two ends. (See No. 81
The next thing is the detector. Get a
piece of wood FIVE by three-quarters by
three inches: this will be the base. Next
get a piece of wood one-half by one inch
by one-half inch. Screw this piece Of
wood one-half inch from one end and one
inch from one side. Next get a piece
of spring brass One-half inch wide and
three and one-half inches long. This is
to go on top of the wooden block, so
drill four holes. The first two holes are
to be quarter of an inch away from
each other, therefore the first hole will be
a quarter of an inch from one end and
the second a quarter of an inch away
from the first The third hole can be
bored one and One-half inches from the
end from which the other two were
bored The fourth hole should be bored
two and one-half inches from the end.
Now take the other end and bend it
down quarter of an inch and file it to
a point like No. /. Next get a brass
bolt two inches long. Put it through
the base and through hole No. /. This
hole will have to be made to fit the bolt.
Now nut the nut on top of the piece of
spring brass. Next get piece of brass
two inches by two inches by One-sixteenth
of an inch and put it right ON the edge
and One-half inch from each side. Drill
four holes, one in each corner; bore an
other hole one inch from one corner and
put a binding post in it. Now screw
this down on the base. Next Get a piece
of silicon. Now you are ready to use
the detector by regulating the nut on the
bolt. Get n strong or a light adjustment
on the silicon. When it comes in the
loudest leave it alone.
Get three pieces of tissue paper twelve
by three inches. Now from a florist
two pieces of tin foil ten inches by two
inches. Put on one end of each piece Of
tin foil wire. Now lay piece Of tissue
paper down, and on top Of that put a
piece of tin foil. Be sure TO let the wire
stick outside Cf the tissue paper quite q
bit. Next put piece of tissue paper on
top of the first piece Of tin foil and then
put the second piece of tin foil on top OF
that and then put the third piece of tissue
paper ON top of that; roll it up and put
ii in a small cigar box with two binding
posts on top (NO. OJ.
You cannot make a phone, but you csCs
buy Il sevepty-hve ohm phone for fifty
or seventy-fve cents.
The aerial can be made of any kind OF
wire, but insulate it well, for this is the
thing that discourages a lot Of amateurs.
Your ground can be a water or gas
pipe, or if you live in the country the well
will do.
No 7 is a desirable way for the be-
ginuer to hook up his apparatus.
No is the same hook-up, showing how
the instruments look.
The cost Of the materials is as fol-
for Slider, fifteen cents; t~o binding posts,
,en cents. shellac, FIVE cents. Cost Of
tuner. between eighty-fve cents and one
UTT' TIn foil, fifteen cents; -ryo binding posts,
ten cents. Cost of condenser, twenty-five
cents.
Wood, twenty cents; two binding posts,
ten cents brass, twenty-five cents bolt,
five cents; silver, fifteen cents. Cost Of
5atartor seyenty-fve cents