With that he pulled the table from the centre of the room, revealing an iron chain some three feet in length, attached at its lower end to a staple in the floor by means of a clevis and pin.
The chain was not lying loosely, but was rigidly upright, its upper end wound about a white block—a six-inch cube, as I judged.
Climbing to the table top, the professor stepped thence to the cube, poising himself for a moment on one foot. Then he sprang to the floor again.
"This cube," he explained, laying one hand on the block with an affectionate gesture, "is of steel, and has been treated with my insulating compound. To all appearance it is falling upward with a force sufficient to draw the chain rigidly to its full extent and to support my weight."
"Poppycock!" muttered the coal baron.
"A trick!" exclaimed Meigs.
The other two remained silent. They were bewildered, perhaps impressed.
"Let us see whether it is a trick or no," went on Quinn. "Pray come forward, gentlemen, and lay hold of the chain. There is no danger in the little experiment with which I am going to amuse you, and I think it will dispel your doubts."
The gentlemen hesitated, but finally came forward, got down with some difficulty, and grasped the chain as directed.
"Hold tight!" exclaimed the professor, and drew the pin from the clevis.