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“Moving Force. 241 
water be supposed to issue with the velocity 
due to the pressure. Put g—16,, feet. 
If BC be a cylindrical tube, and if g repre- 
sent the quantity of water it contains from B 
to C, the centrifugal ie upon a section 
of the arm at C, will be NUR? 5 and what- 
4¢ BC 
ever the length BC may bes the diameter 
remaining the same, g being as BC, the 
centrifugal pressure at C will always be as 
0? ; and it will be equal to the pressure of a 
Beapeorticaler column of water whose height in 
feet 1 al Then if h express in feet the hei ght 
AB of the water in the vertical tube, ht 
will be the whole pressure at ‘C ; and if a eda 
in feet the area of the most contracted section 
) a 
4p :) will express the 
reaction, which being multiplied by v, the 
space through which it acts in a second, gives 
of the orifice, 2a (it 
a” 
2av\ h+—~q, ) for the total moving force of 
5 ; 
the arm in a second. But a part of this 
moving force is expended in producing the 
rotatory motion of the water, and in raising it 
to the height. For, if we suppose a 
perpendicular tube CP. to: rise from the arm 
at C, the surface of the water in that tube 
Hh 
