in the following manner: A cheap
glass tumbler is partly filled with water and then about 1/2 in.
of safe, light burning oil, placed on the water. Cut a thin strip
from an ordinary cork and make a hole in the center to carry a
short piece of wick. The wick should

[Illustration: Lamp]

be of such a length as to dip into the oil, but not long enough.
To reach the water. The upper surface of the cork may be protected
from the flame with a small piece of tin bent over the edges and a
hole punched in the center for the wick. The weight of the tin
will force the cork down into the oil. The level of the oil should
be such as to make the flame below the top of the tumbler and the
light then will not be blown out with draughts. The arrangement is
quite safe as, should the glass happen to upset, the water at once
extinguishes the flame.
--Contributed by G. P. B.

** How to Make a Paper Aeroplane [329]

A very interesting and instructive toy aeroplane can be made as
shown in the accompanying illustrations. A sheet

[Illustration: Folding the Paper]

of paper is first folded, Fig. 1, then the corners on one end are
doubled over, Fig. 2, and the whole piece finished up and held
together with a paper clip as in Fig. 3. The paper clip to be used
should be like the one shown in Fig. 4. If one of these clips is
not at hand, form a piece of wire in the same shape, as it will be
needed for balancing purposes as well as for holding the paper
together. Grasp the aeroplane between the thumb and forefinger at
the place marked A in Fig. 3, keeping the paper as level as
possible and throwing it as you would a dart. The aeroplane will
make an easy and graceful flight in a room where no air will
strike it.
--Contributed by J.H. Crawford, Schenectady, N. Y.

** Bronze Liquid [329]

Banana oil or amyl acetate is a good bronze liquid.

** A Wrestling Mat [330]

The cost of a wrestling mat is so great that few small clubs can
afford to own one. As we did not see our way

[Illustration: Made of Bed Mattresses]

clear to purchase such a mat, I made one of six used bed
mattresses (Fig. 1) purchased from a second-hand dealer. I ordered
a canvas bag, 12 ft. 3 in. by 12 ft. 9 in., from a tent company,
to cover the mattresses. The bag consisted of two pieces with the
seam along each edge. The mattresses were laid side by side and
end to end and the bag placed on and laced up as shown in Fig. 2.
--Contributed by Walter W. Whi