438 SEVENTH REPORT—1837. 
observations made by independent observers.—See Wave 
XLV. 
Chrono- | Chrono- | Difference |} Chrono- | Chrono- | Difference 
meter a. | meter #8. | of interval. || meter a. | meter B. | of interval. 
0-0 0-0 0-0 89-00 89-5 
9-75 9:5 — 0:25 99-50 100-0 
19-50 19:0 — 0:25 110-00 110°5 
28-50 29-0 0:00 120-50 121-0 
38°50 39-0 0:00 =| «181-00 1315 
48°50 49:0 0-00 || + 141:50 142-0 
58°50 59-0 000 «|| 151:50 152-5 
68°50 69-0 0-00 16250 | 1630 
79:00 795 0:00 173°00 1735 
One of the first objects of inquiry was, to determine whether 
there existed any important difference in the phenomena of 
waves generated by different methods and by bodies of different 
forms, or to ascertain whether a wave being given in height and 
depth, the phenomena were the same and independent of the 
source from which it had been originally derived. To give the 
value of the comparison, we shall collate the history of four 
waves generated by four different methods, and very nearly of 
the same magnitude and in the same depth of fluid. 
WAVE XIX. WAVE XV. WAVE VIII, WAVE VII. 
Generated by pro- || Generated from Generated by Generated from 
trusion of solid C, chamber B. simple impulsion. reservoir A. 
Depth = 3°95 in. || Depth = 3'87 in. Depth = 4°15 in, Depth = 4°07 in. 
Sec. In. Sec, In, Sec. Tn, Sec. In. 
10'5 | 5-40 a5 vse vee as eos <7 
10°5 | 5:22 eee 5°30 te 5:10 bee ‘ 
10-5 | 515 || 100] 532 || 11:0 | 5:02 zl see 
10:5 | 5°02 |} 10°5 | 5:20] 11:0 | 4-95 vee ose 
10:5 | 4:83 ]} 11:0} 503 || 11:5 | 4°85 oe 
120 | 4:76 || 11:0 | 4:96 | 11-5 | 4°75 
12:0 | 4:67 || 11:5 | 468 |) 11:0 | 4:69 aah - 
11:5 | 458 || 11-0 | 460 |) 11:5 | 461 ele 4-62 
11:5 | 455 || 12:0] 4°55 | 120 | 4:55 ace 4:58 
11:5 | 4:50 |} 120} 4:43 | 11:0] 4:48 || 11-5 | 452 
11-5 | 4:42 || 11:0] 4:36 | 12:5] 4-43 || 115 | 4-46 
——]] 11°5 | 4:40 || 11:5 | 440 
11°13) 4:82 || 11-11} 4°84 |} 11-5 | 4:37 || 115 | 4°35 
12:5 | 4:36 || 12:0 | 4:27 
12:0 | 4°33 || 12:0 | 426 
12:0 | 4:29 || 12:0 | 4-26 
| 11:60) 4:66 11°70) 4°41 
These columns contain the intervals of description of success- 
ive spaces of 40 feet cach, with the mean depth reckoned from 
