rt eee ae 
Report of Messrs. Humphreys and Abbot. 25 
and Baton Rouge by means of floats at different depths, from 
boats anchored in the stream at various distances from the shore. 
All the observed velocities of each set, that is, from each anchor- 
determinate values, represented by x, ¥,, %» Y,, We may elim- 
inate P, and obtain the value of R? in terms of 2, ¥, 2,,, Y,» 
vertex of the curve, the plotted or tabulated velocities are not 
themselves the values of « required. Regarding the curve as a 
representation of the condition of things in a vertical 
abscissas will then be the differences between the maximum 
velocity and the velocities at other points of the curve; and the 
ordinates will be the distances of those points from the axis, in 
decimals of depth of the river. The values of R? as computed 
Am. Jour. sg naa Sexizs, VoL. XXXVI, No. 106.—JuLr. 1863. 
