oo
long without proper treatment, will cause the metal to break. To
overcome this hardness, heat the copper over a bed of coals or a
Bunsen burner to a good heat. This process is called annealing, as
it softens the metal.

The appearance of a bowl is greatly enhanced by the addition of a
border. In the illustration the border design shown was laid out
in pencil, a small hole was drilled with a band drill in each
space and a small-bladed metal saw inserted and the part sawed
out.

To produce color effects on copper, cover the copper with
turpentine and

[Illustration: Shaping the Bowl and Sawing the Lace]

hold over a Bunsen burner until all parts are well heated.

** Cleaning Furniture [185]

After cleaning furniture, the greasy appearance may be removed by
adding some good, sharp vinegar to the furniture polish. Vinegar,
which is nothing else than diluted acetic acid, is one of the best
cleansers of dirty furniture.

** Melting Lead in Tissue Paper [185]

Take a buckshot, wrap it tightly in one thickness of tissue paper,
and, holding the ends of the paper in the fingers of each hand,
place the part that holds the shot over the flame of a match just
far enough away from the flame not to burn the paper. In a few
seconds unfold the paper and you will find that the shot has
melted without even scorching the paper.
--Contributed by W. O. Hay, Camden, S. C.

** The Principles of the Stereograph [185]

Each of our eyes sees a different picture of any object; the one
sees a trifle more to the right-hand side, the other to the left,
especially when the object is near to the observer. The
stereoscope is the instrument which effects this result by
bringing the two pictures together in the senses. The stereograph
produces this result in another way than by prisms as in the
stereoscope. In the first place there is

[Illustration: Looking Through the Colored Gelatine]

only one picture, not two mounted side by side. The stereograph
consists of a piece of card, having therein two circular openings
about 1-1/4 in. diameter, at a distance apart corresponding to the
distance between the centers of the pupils. The openings are
covered with transparent gelatine, the one for the left eye being
blue, that for the right, orange. The picture is viewed at a
distance of about 7 in. from the stereograph. As a result of
looking at it through the stereograph, one sees a colorless black
and white picture which stands