Evening star., 1922-05-27
EXPERT ADVICE ON RADIO
No. l2.-Some Useful Hints.

ton AS soon as cooi it is ready for
use.
T" fasten celluloid to wood: Shellac.
one part; spirits of camphor. one part;
alcohol and camphor go per cent?,
three to five parts.
To fasten rubber to wood: Shellac.
one ounce: gutta percha. one ounce;
sulphur. forty-five grains; red lead.
forty-flve grains. Melt the shellac and
gutta percha together and then add the
sulphur and red lead while stirring
briskly. Use when hot.
To Hold Brass Rod.
If a round rod or pipe is to be held in
a wise, do not clamp it in the jaws, but
use a wood block made by boring a
hole through the center OF the wooo
slightly smaller than the size OF the
pipe or rod. Saw the block in two and
halves before clamping the whole in
the vice. Fig. l.
Extemporized Pipe Wrenches.
Quite frequently you may wish to
hold a rod or pipe and have no pipe
wrench wise at hand. In such case
you may use an ordinary monkey
wrench and a three-cornered file. as
shown in Fig. 2; while, II you nave no
monkeywrench or do not wish to scar
the pipe or rod. you may hold IT Sc
curely by means Of rope or cord, as
shown in Fig 8. Wrap the cord, whlcn
should be doubled upon itself, AROUND
the pipe or rod in the direction in which
1t is to be turned. Place a stick or bar
in the loop as lever, and by holding
the slack of the rope with one nand
and turning on the lever with the otner
YOU can exert tremendous purchase
If the rope shows signs OF slipping
dampen it with water.
Cutting Rubber.
II YOU have ever tried to cut rubber
with knife you know how difhcuit II Is Is
to make a clean. even cut. But is IL
an easy matter when you apply the
right method All that is necessary is
to use a sharp knife and cold water.
Draw the knife back and forth IKE
saw and keep the surfaces OF the Luo-
her wet. You will find that the rubper
cuts like cheese, If the rubber TO De
cut is large it is often best to DO the
cutting under water.
Cleaning Files.
Files which are used on brass, leao;
conner or wood soon become closseu
and useless. This may be larseiy
avoided if the files are rubbed with
chalk before using. Then II they pc
come clogged they may easily pc
cleaned and made as good as new by
soaking them in acid. For wooo OF
grease use diluted sulphuric acid; for
lead, zinc, brass, copper, soider or TN
use muriatic acid diluted with water:
AS soon as the material is removed
wash the files in clear water. rinse in
a strong soda solution. dry by heat
and rub them with an oiled rag.
To Straighten Wire.
Very freouently wire must be
straightened before it can be used.
This is especially true of old wire
which has been used for some other
purpose, and very often great deai
of good wire is wasted due to the fact
that the owner does not KNOW no" 10
straighten it.
If the end of the wire is fastened
to some fixed object and the wire is
then pulled upon steadily until II is
felt to give slightly it will be found
perfectly straight. This method may
be used for wire up to No. ) or IN
size, but the larger the wire the long
er the piece must be in order to
straighten it in this way. For large,
stiff wire, in short pieces, the best
way is to either whip it down upon
some smooth, level surface or else,
after partly Strengthening it by a
mallet or hammer, roll it back and
heavy pressure on the upper board.
Using Wire From a Coil.
If coil of wire is not handled
snarled and tangled. When starting
to use a coil do not cut or remove
the strings or wires which hold the
turns together. Find one end. slip
this out from the binding string and
then, by pushing back these fasten-
ings as you use the wire-in exactly
the same way that key is placed on
a key ring-the wire may be used
without tangling the coil. If the fas-
Jennings are too tight to permit this,
place slightly larger fastenings
around the coil and then remove the
original ones. AS the coil becomes
reduced in size, replace the fasten-
ings with smaller ones so they will
not all slide together in one spot. An
other excellent method is to place
rubber bands around the coil in place
of the string or wire fastenings. If
you are using much wire the best
plan is to purchase it on spools or
reels which may be hung up or slip
ped over a peg or nail where they
can revolve readily. but not so loose
ly that they will unroll a super
f1uous amount of wire.
Copyright. 1927
(Monday-"To Make Simple Crystal Receiv
ing Set.'D