Money Augmented By An Optical Illusion

In a large drinking-glass of a conical shape, (small at the bottom and

wide at the top,) put a shilling, and let the glass be half full of

water; then place a plate on the top of it, and turn it quickly over,

that the water may not escape. You will see on the plate a piece of

coin of the size of half-a-crown; and a little higher up another the

size of a shilling.

It will add to the amusement this experiment affords, by giving the

glass to any one in company, (but who, of course, has not witnessed

your operations,) and, desiring him to throw away the water, but save

the pieces, he will not be a little surprised at finding only one.

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