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The Magic Vessel

On the bottom of a vessel, lay three pieces of money, the first at A,
the second at B, and the third at C, Fig. 3. Then place a person at D,
where he can see no farther into the vessel than E. You tell him, that
by pouring water in the vessel you will make him see three different
pieces of money; and bid him observe, that you do not convey any money
in with the water. But be careful that you pour the water in very
gently, or the pieces will move out of their places, and thereby
destroy the experiment.

When the water rises up to F, the piece at A will be visible; when it
reaches G, both A and B will be visible; and when it comes up to H,
all three pieces will be visible.

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