Fig. 11. 



Ikiv INTRODUCTION TO HYDROSTATICS. 



course out of the Lake, and from whence it flows through valleys, occa- 

 sionally forming other small lakes, till it reaches the sea. 



A Fountain is a spring conducted perpendicularly upwards by a spout 



or adjutage, A (Jig. 11). It would rise as 

 high as the reservoir, B, were its motion 

 not impeded by the resistance of the air 

 and the friction against the sides of the 

 spout whence it issues ; besides, as all the 

 particles of water spout from the tube with 

 an equal velocity, and as the pressure of the 

 air upon the exterior particles diminish their 

 velocity, they will in some degree strike 

 against the under parts, and force them 

 sideways, spreading the column into a head, 

 and rendering it both wider and shorter 

 than it otherwise would be. Besides this, 

 the resistance of the air prevents even the first particles projected from 

 the tube from rising to the height of the water in the reservoir. Were 

 there no such resistance, it would rise to that height, and no higher : of 

 course, being resisted, the elevation to which it rises is diminished. On 

 both accounts, therefore, the height of such a fountain falls very consi- 

 derably short of the height of the water in the reservoir. 





