AN EXPERIMENT IN GRAVITY
Give a person two half-crowns and request him to hold them horizontally between the tips of his thumb and finger of his right hand, the coins touching each other. Then request him to drop the lower coin in his left hand and you will tell him which side will come uppermost. First note which side of the coin is underneath when you place them in position, for that will be the uppermost side when it reaches his left hand. The lower coin will turn completely over in the act of falling: nothing can prevent it. The distance between the hands should be from fourteen to sixteen inches.