iar property is
also found in ice.

[Illustration: Bending Cold Sealing-Wax]

** Homemade Pottery Kiln [62]

A small kiln for baking clay figures may be built at a cost of $1.
The following shows the general plan of such a kiln which has
stood the test of 200 firings, and which is good for any work
requiring less than 1400 deg. C.

Get an iron pail about 1 ft. high by 1 ft. across, with a cover.
Any old pail which is thick enough will do, while a new one will
cost about 80 cents. In the bottom of this cut a 2-in. round hole
and close it with a cork or wood plug, A, Fig. 1, which shall
project at least 2 in. inside the pail. Make a cylindrical core of
wood, B, Fig. 1, 8 in. long and 8 in. across. Make a

[Illustration: Homemade Pottery Kiln]

mixture of clay, 60%; sand, 15%; and graphite, 25%, kneading
thoroughly in water to a good molding consistency. Line the pail,
bottom and sides, with heavy paper and cover the core with same.
Now pack the bottom of the pail thoroughly with a 2-in. layer of
the clay mixture, and on it set the paper wrapped core, carefully
centering it. The 2 in. of space between the core and the sides of
the pail all around is to be filled with clay, C, as is shown in
the sketch, using a little at a time and packing it very tight. In
like manner make the cover of the kiln, cutting the hole a little
smaller, about 1 in. At the edge or rim of the cover encircle a
2-in. strip of sheet iron, E, Fig. 2, to hold the clay mixture, C.
Set aside for a few days until well dried.

While these are drying you may be making a muffle, if there is to
be any glazing done. This is a clay cylinder (Fig. 3) with false
top and bottom, in which the pottery to be glazed is protected
from any smoke or dust. It is placed inside the kiln, setting on
any convenient blocks which will place it midway. The walls of the
muffle should be about 1/2 in. thick, and the dimensions should
allow at least 1 in. of space all around for the passage of heat
between it and the walls of the kiln. By the time the clay of the
kiln is well dried, it will be found that it has all shrunk away
from the iron about 3/8 in. After removing all the paper, pack
this space-top, bottom and sides with moist ground asbestos. If
the cover of the pail has no rim, it may be fastened to the
asbestos and clay lining by punching a few holes, passing wire
nails through and clinching them. Fit all the parts together
snugly, take out the plugs in the to