ON WAVES. 



349 



Col. F gives the velocities due to the depth, calculated by the formula 

 c= Vg(h — k). 



Col. G are the differences between observation and the formula. 



Table XII. 



Observations on the Velocity of Negative Waves of the First Order. — In a 

 triangular channel with sides sloping at 45°. 



Cols. A, B, C, D, E, F and G, as in the preceding table. 

 Col. H is the ratio of defective velocity on the whole. 

 Col. F" is taken, not from the formula like F, but from observed positive 

 waves in the same channel of the same height. 



Col. G" contains the differences between F" and E. 



