CHAP. II. 



ARTESIAN WELLS. 



49 



The inexhaustible bottle is a bottle of many compartments, each 

 of which is filled with a different kind of liquid. Each compartment 

 communicates with the exterior by a small hole worked through 

 the side of the bottle, which the operator opens or shuts at pleasure 

 with the fingers. He can then pour out the kind of \vine.that he 



FIG. 29. The inexhaustible bottle. 



pleases or that the spectator asks for, or even make a mixture by 

 pouring out two or three liquids at a time. 



These amusing physical experiments are principally based on the 

 action of atmospheric pressure, of which we will now study the 

 more serious and especially the more useful applications. 



