374 S. H. BARRACLOUGH AND T. P. STRICKLAND. 
it is evident that the error due to the change of area of the orifice 
is also negligible. In the accompanying table, in addition to the 
Table VIII. 
Series 7.—Mean hydraulic radius= ‘9 cm. Approximate slope 
= °0415. 
Reduced | 4 
| Same | -Nelosity. | veiboity. atts, tos S| "fared | 
1 | 1009 200393 | 1-903 | 2794 | 23 | 
2 101°8 2:00783 | 1°979 | ‘2964 | 247 
3 107°4 2°03088 | 2-062 | ‘3143 26°5 
4 105°5 202275 | 27178 | ‘3331 29 
5 108°7 2:03625 | 2°404 | 3809 | 337 | 
7 1129 205269 | 2514 | 4004 | 359 | 
6 | 1105 204851 | 2-822 | -4506 
No.7 was made at a slope of -067 5, and the velocity was then reduced 
to the common slope for this series of ‘0415. 
Fig 4. 
Curve A corresponds to Series A. 
B B 
Log f 
Log R 
