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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