196 

 But 



Canon Moseley on the steady Flow of a Liquid. 



wir / a \ wir / ;/ \ 2 "'"" 



T-rdr=-(^-)€-Tr-{^) e™ + C; 

 \wi/ \wi/ 



-m-^-fyn 



1 



6 M 



(16) 



If we assume approximately as before, 



^=2-25, 

 Q R = 2 ~ 



)2 [l-(l + 2-25R>-"»] % . (17) 



In the following Table III. various experiments of M. Darcy 

 on the volumes of water which flow in given times through pipes 

 of different materials and states of their internal surfaces and dif- 

 ferent diameters, and under different heads of water, are com- 

 pared with the above formula. 



Table III., 



New cast-iron pipe, interior clean. Diameter 0*188 metre. 



Index 

 number. 



Velocity of the 



water at the axis 



of the pipe, 



v . 



Discharge per 

 second in cubic 

 metres by ex- 

 periment 

 (Darcy, p.59). 



Discharge per second in cubic metres 

 by theory, 



Q ^^5H 1 - (,+2 * 25R)e ~ 2 " 25R] - 



159. 

 160. 

 161. 

 162. 

 163. 

 164. 



0-885 

 1-303 

 1-747 

 2-280 

 2-922 

 5 082 



0021064 



0031303 



004132 



005635 



006956 



0-11953 



0021332 

 0031391 

 0042088 

 0-054928 

 0070395 

 0-012243 



Old cast-iron pipe, interior covered with deposit. Diameter 

 02432 metre. 



167. 

 168. 

 170. 

 171. 

 173. 



575 

 876 

 1*83 

 2 273 

 4-593 



0-02099 

 0,03287 

 007182 

 08519 

 0-17808 



0-022377 

 0-034029 

 0073147 

 0088297 

 0-17842 



