Ad4 SEVENTH REPORT—1837. 
The trapezoidal channel L was formed by the addition of a 
rectangular portion, 1 inch deep, to channel K. See Plate III. 
fig. 4. 
The trapezoidal channel M was formed by the addition of a 
rectangular portion, 1 inch deep, to channel L. 
Analysis of Observations of Waves in the Channels K, L, M. 
K 
Referenceto | Toteldewh | rreignt of te | inaescrining | ._\Soace, | 1} olgumne 
observations. of the wave. wave. space in next | described. per sec. 
column, 
NG Inches. Inches, i. Feet. oy cal 
LIK: 4-14 “10 19:5 40-0 2-05 
LXXVIIL. 4-2) 17 175 40-0 2:28 
LXXVI.... ; } ; : f 
CRXVI 4:42 37 40°75 102-2 2-50 
LXXVIII. k ‘ : : ; 
eK 4:46 41 31-7 82-2 2-60 
LX XVIII. 5:31 1:27 5-0 146 2-92 
L 
LXXXV.. 5-24 +24 125 40-0 3-20 
LXXXIL - 5:42 “42 135 40:0 3:00 
ESR. 5 7 
LXXXIV. 553 | 53 42:0 120-0 2:90 
LEXKV:.. 
LXXXIV. 568 68 135 411 3-04 
LXXXIIL 5°70 70 12°7 41] 3:23 
LOTR: 577 77 20:0 611 3:05 
LEKKI: L . 4: 
CXXXIV. } 6-41 1-41 85 29 2 3-43 
Xs Kil. 6:47 1:47 45 146 3:24 
LXXXIIL. 6-67 1-67 4-0 146 3°65 
EXXXKV.: 6:92 1-92 4-0 146 3-65 
M 
RO. “Assz edad : ‘ . : 
came zu 6-41 40 13-0 40-0 3-08 
Wise, 5 - , 
ear Re 6:87 86 114 40-0 350 
KOE: t : , , 
SCE Ay 7-43 1-42 9:25 35-7 3:86 
The wedge-formed channel was of uniform depth, twelve 
inches wide at the broad end, and tapering to an edge at the 
