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Popular Mechanics Co.

"The Boy Mechanic: Volume 1 700 Things for Boys to Do"

Secure two
glass vessels having straight sides of the same height, one 18 in.
in diameter (Fig. 1) and the other 12 in. in diameter (Fig. 2).
The smaller is placed within the larger, the bottoms being covered
with moss and aquarium decorations which can be purchased at a
bird store. Fill the 3-in. space between the vessels with water.
Cut a piece of galvanized screen into circular form to cover the
larger vessel, and hang a bird swing, A, Fig. 3, in the center.
Place the screen on top of the vessels so that the swing will hang
in the center of the inner vessel. A weight--a box filled with
sand will do--should be placed on top of the screen, over the
smaller vessel, to keep it from floating. Moss should be put over
the top of the screen so that the two separate vessels can not be
seen.
[Illustration: 18 in. Diameter; 12 in. Diameter]
[Illustration: Birds and Fish Apparently Together]
Place the birds in the inner vessel and the fish in the water. The
effect is surprising. To complete the effect and aid the illusion
the vessels can be set in a box lined with black velvet, or on a
pedestal.


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