42 Canon Moseley on the steady Flow of a Liquid, 



this case be neglected^ as may that which is due to the contrac- 

 tion of the current in the act of entering the pipe, its section 

 being so great as compared with its periphery. 



On the whole, then, 7 is to be expected to be, in this case of 

 an inclined closed pipe fed by an open stream, less than in the 

 case of a horizontal closed pipe fed from a reservoir ; and it may 

 be less than unity. 



This will appear from the two following Tables, which have 

 reference to experiments made with the two rectangular pipes 

 above described, in one of which the value of y is assumed to be 

 i"5, and in the other 1. 



Experiments, series 52, p. 170, closed rectangular pipe, breadth 

 (^>)=0'48 metre, depth (c) = -3. 



By equation (60), 



^ 2 (-48 + -3)2 r^ /•48x-3y \ _-48x-3y-| 



7=1-5, 



Q=3-77{l--96805[i'o, 



Q=-11997225i;o (61) 



Table Vlll. 



Experiments, Series No. 52, p. 170. Closed rectangular pipe, 

 0'48 metre broad, 0*3 metre deep. (March and April 1859.) 







Discharge per second in 



Index 

 number. 



Velocity 

 at axis, 



Wo- 



cubic metres, 



By theory, 



By experi- 







y = l-5. 



ment. 





metre. 



m. c. 



m. c. 



1. 



0-465 



0-0558 



0-054 



2. 



0-672 



0-0806 



0-078 



3. 



0-886 



0-1065 



0-100 



4. 



1103 



0-1323 



0-129 



5. 



1-306 



0-1567 



0-155 



6. 



1-634 



0-1960 



0-191 



7. 



1-777 



0-2132 



0-203 



8. 



1-966 



0-2359 



0-233 



