442 SEVENTH REPORT—1837. 
ee 
Reference to | Total depth ggeignt ofthe | im devoribmg | | Soace, | gavein fect 
observations. of the wave. wave. space innext | described. per sec. 
column. 
Inches. Inches. Seconds. Feet. 
EN cack 7°33 *29 730 320-0 4:39 
Ve = cscs . 7:44 “40 36:0 160:0 4:44 
DAS ceesas 7:68 “64 28:0 1200 4°37 
LIII. ...... 770 66 27:0 120°0 4:43 
XLVIII.... 7:74 1°54 26°5 120°0 4:44 
LWety<. es 7:75 oF (| 35°5 160:0 
LEMS oc sce 7:79 ‘75 27:0 120:0 4:43 
LANs Siew sels 7°82 78 26°5 1200 4:53 
VA tescace 7°84 80 27-0 120°9 4°43 
LAW th aes cay 7:37 "83 26°5 120°0 4:53 
1G aes ARR 8:00 78 26°5 120-0 4°53 
Observations on the influence of the form of the channel on 
the propagation of the wave extend from Wave LVI. to Wave 
CXLIX., at the end of the report. 
The triangular channel H was of the form given in Plate 
III., fig. 2, its depth having varied by the quantity of water 
poured in, its vertex undermost, one side vertical and the other 
inclined to the horizon at an angle whose radius is to its tan- 
gent as 3 to 2. In all these experiments the wave was ob- 
served to be low and flat on the deep side of the channel, while 
it remained high and cusped on the shallow side; it was also 
long on the deep side, and diminished in length uniformly with 
the diminution in depth. The following table contains an ana- 
lysis of the experiments in the channel H. The first column 
refers to the individual wave made the subject of experiment, 
so that it may be referred to in its place at the end of the re- 
port. The second column contains the total depth reckoned 
from the top of the wave on the deep side. The third column 
gives the height of the wave. The fourth column contains the 
number of seconds employed in describing the number of feet 
given in the fifth column ; and the last column is the resulting 
velocity. 
It should be recollected, before proceeding to compare these 
observations with any formula, that the attraction of the sides 
at the bottom of the channel in the acute angle of the channel 
must be considered as having fixed a portion of the fluid which 
was not affected by the motion of the wave, and which should 
therefore be subtracted from the effective depth. 
