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To remove the table-napkin on a corner of which a wine-glass full of water stands near the edge of a polished table, take hold with the left hand of the part that hangs over the edge and raise it to a horizontal position. Then strike hard downward with the right hand, at about six inches from the table, and the cloth will come away, leaving the wineglass altogether undisturbed—an illustration of what is known as the vis inertiæ.
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