58 THE SEVEN FOLLIES OF SCIENCE 



raised by the buoyancy of the ball ; because the moment 

 the small valve in the center is opened (although only the 

 size of a pin's head), No. 2 valve will have taken upon it- 

 self to sustain the whole column of water from A to B. 

 The said ball (No. 8) having passed through the valve 



Fig. 13. 



No. 3, will, by appropriate weights or springs, close ; the 

 ball will proceed upwards to the next valve (No. 2), and 

 perform the same operation there. Having arrived at A, 

 it will float upon the surface three-fourths of its bulk out 

 of water. Upon another ball in due course arriving under 

 it, it will be lifted quite out of the water, and fall over the 



