ON WAVES. 489 
Alth Aug., 1837. WAVE LXXVIII. Triangular Channel (K). 
Generated by protrusion of solid parallelopipedon C. 
Times observed directly at Stations y and 3, single transits. 
Time, a Russell, Index, y Hamil, Index, 3} Donaldson. 
Statical level observed at | 3 a i O10} Corrected depth = 4-04 inches, 
A B C D Ej) A B 
Cc D E 
feet. | « sec.'B sec.|y in.|3 in.|9/in.'¥ in. in. || feet. | x sec.|@ sec,|y in.|d in.|9/in.|3’in.| in. 
00) 0-0) ... | 2°0 } ...} 1:95) ... | 5°99) 55-7) 20-5] ... | ... 10°32] ... 10-22) 4-26 
14-6) 5-0] ... | ... [0°70] ... |0°60]4:64|| 75°7 | 29-5) ... | 0-25) ... | 0-20) ... | 4-24 
35°7| 12:5] ... | 0°50) ... 0-45| «+» | 4°49]| 95-7} 38°0] ... | ... 0°20) ... 10°10) 4-14 
llth Aug., 1837. WAVE LXXIX. Triangular Channel (K). 
. Generated by protrusion of solid parallelopipedon C. 
Times observed directly at Stations y and 3, single transits. 
Time, « Russell, Index, y Hamil, Index, 3 Donaldson. 
Statical level observed at{ Ba a O10} Corrected depth = 4:04 inches. 
A B Cc 
oe Le a Sg Ee ee aE — EEE See aa eee es 
feet. | « sec.|6 sec.|y in.|d in.'/in./d'in.| in. |} feet. | « sec.|@ sec.|y in.|d in.|9/in |’in.| in. 
0-0} 0-0) .., | 2:20) ...| 2°15) ... | 6-19) 75°7| 29-5] ... | 0-20) ... | 0-15] ... | 4-19 
14-6] 5:0] ... | ... |0°70) ... 0-60} 4-64)) 95-7 | 37-7] ... | ... [0°19] ... 10°09] 4-13 
35°7| 13:0) ... | 0-45) ...| 0-40) ... | 4-44/115-7 | 49:0] ... | 0-10} ... | 0-05) ... | 4-09 
55°7| 21-2) ... | ... |0°32) ... [0-22 4°26/185°7 obsess abl wremssalf es 
Remarks.—The times at y and 3 were differently observed; and should be separated. 
The wave was long and low on the deep side, and tapered to a point on the other 
side. It broke during the whole period of observation continually on the shallow 
edge, leaving a portion behind, from which subordinate waves were formed. 
llth Aug., 1837. WAVE LXXx. Trapezoidal Channel (L). 
Statical level observed at{ ie be 0-00} Corrected depth = 5:00 inches, 
Wave observed Wave observed 
by sight. in glass index. 
25 inches high. | 1‘5 inches high. 
OF reas! ere a OMe cae 2! Sez 
(Ss Resa on 7!) lal L2H a OS , 
Observations of this kind having been repeated, it was found that high waves, exceeding 
about half the mean depth, were indicated higher on the side by direct sight than in 
the index, up to about the limit when the excess became nearly one half of the whole 
height. 
