FLUID FORCES. 



pressing downwards, is transmitted sideways, and 

 then beneath the ship is transmitted upwards. 

 One of the effects of this principle, expressed 

 as proverbial philosophy, is that water will 

 find its own level ; because it is only when it 

 has done so that the pressures at every point 

 on any level transmitted in all directions are 

 equal, and balance one another. 



M 



FIG. 20 PRINCIPLES OF THE HYDRAULIC PRESS. 



Let us then take the arrangement in Fig. 

 20 for letting water find its own level. 



A and B are two barrels or cylinders, whose 

 inside sectional areas are just equal to one 

 square inch each. D, E, F, and G are four 

 similar barrels. All six barrels communicate 

 by small tubes connecting them at the bottom. 



At first the tap C is closed, so that only 

 A and B communicate, and water is poured 

 into one of them. It speedily finds its level. 



79 



