ON THE PERIODS AND NODES OF LOCHS EARN AND TREIG. 843 
Correcting for the map error, we have :— 
aT, = 10-25", 
Pies eai tee 
l= 3°49", 
In this case Du Boys’ value is about 12 per cent. in excess for the uninodal period ; only about ‘6 per 
cent. in excess for the binodal; while it is about 5 per cent. in defect for the trinodal. The difference 
between Earn and Treig in this last respect may be due to the fact that at the shallow end of Treig the 
normal points lie above the representative parabola; whereas the opposite is the case with Earn. 
Nopves or Locu TREtc. 
§ 26. The table of the signs of (,, Go, C,, corresponding to that given for Earn on 
p. 832, is as follows :— 
| 
| by & bs 
= 
Uninodal . ; ; : | - - + 
isbimodalNe a4 ie. ou | 5S Pe eiih ad 
Trinodal . : : F = 4 i 
The uninode therefore lies north of the deepest normal point. The two binodes 
are on the same side of the deepest normal point—of course, on the northern side. One 
trinode lies south of the deepest normal point; and a rough trial easily shews that 
there is one, and therefore two, trinodes north of the deepest normal point. 
UninovE or Treia (North of Deepest Normal Point). 
§ 27. We have taken T, = 9°14’, c=3°8073. 
Coefticients of L’(3°8073, z). 
¢ ¢ B, 
0 | Uo | een) | eB. | es 
7. o cr | 
0 logie= 58062 | 
1 9037 T-95602 | 58062 58062 
2 ‘3654 156282 ' 53664 23561 
3 6827 183424 09946 | 1:62234 
4 “8096 1:90829 T-93370 | 1:33164 
5 8731 T-94106 | 184199 T-14302 
6 9093 T-95873 | 1°78305 T-00490 
"i 9320 | 196942 174178 | 289668 
8 “On — | T-97641 | T-71120 | 2:80811 
9 ‘9577 T:98123 _ * 168761 | 373337 
