298 Frederick Guthrie on Stationary Liquid Waves. 



§ 14. Variation in length. Experiments with W. 

 In ]/ there were 136 pulsations. 

 }> 1 » 135*5 „ 



,, 1' „ 136 



Mean number of pulsations in 1' for W . . . 135*8. 



In this square trough it is difficult to avoid the travelling of 

 the nodal lines till they become diagonals. 



Experiments with X. 



In V there were 111 pulsations. 



n v » no „ 



„ i; „ no 



}} & a "21 „ 



Mean number of pulsations in 1' for X . . . 110*4. 



Experiments with Y. 



In 2' there were 189 pulsations. 

 „ 2' „ 189 „ 



„ 2' „ 189 



Mean number of pulsations in 1' for Y . . . 94'5. 



Experiments with Z. 



In 2' there were 169*5 pulsations. 



4' 



338 



84*5. 



Mean number of pulsations in 1' for Z . . 



Before collating these results we must examine the effect of 

 shallowness. 



§ 15. Effect of depth on binodal undulations in rectangular 

 troughs. 



Depth. 



millin'. 

 150 

 170 

 190 

 210 

 220 

 240 

 260 

 280 

 300 



Number of undulations per 1' in 



Z. 



Y. 



X. 



W. 



82" 



83 

 84 

 84-5 

 84-5 



84-5 



92" 

 93 

 94 

 94 5 

 94-5 

 94 5 



ioi)" 



110 



110-4 



110-4 



110-4 



110-4 



133 



134 



135-8 



135-6 



135-4 



135-6 



135-8 



136 



135-6 



From this Table it appears that in rectangular troughs of the 

 same width and different lengths, a diminution in the depth of 



