832 PROFESSOR CHRYSTAL AND MR E. MACLAGAN-WEDDERBURN 
normal point, and Eastern end of the lake by (, G@, , respectively, we see from 
H.T.S. § 39 that 
AC(¢, 1) _: oes ; 
“Se, 1) sinnt, Ly ase, 1) sin mt . : ; (19). 
A : 
Hence, if we bear in mind the values of ¢ and c’ corresponding to the first three pure 
seiches, we get the following table of relative signs :— 
by ai im 
Uninodal : : : - = ae 
Binodal . ‘ : ; St ae 
Trinodal : 4 : = ab a 
We infer that the uninode is east of O; that the binodes are on opposite sides of O; 
and that there is one trinode west of O, and two east of O. 
§ 13. Uninope or Earn. (Hast of Deepest Normal Point.) 
We have taken T, = 14°50’, c= 3°5785. 
Coetticients of L’(3°5785, z). 
c Cc . B, 
= [ey — et o (os 
2 log( 1 5) logB, | log = 
1 log ¢ |= *D5370 
2| 7893 T-39724 55370 | °55370 
3| 4036 160595 45094 | -14991 
4| -7018 T-84621 | 05689 | 157977 
5| “8211 191440 | T-90310 | 1-30104 
6 |  -8807 194483 | 181750 | T-11853 
7|  -9148 196133 | 176233 | 3-98418 
8 | 9361 197132 | 1-72366 | 3-87856 
9} +9503 97786 | 1-69498 | 5-79189 
10)  -9603 198241 | 1-67284 | 3-71860 
11]  -9675 98565 | 1-65525 | 365595 
