838 PROFESSOR CHRYSTAL AND MR E, MACLAGAN-WEDDERBURN 
§ 18. Western Trrnope or Earn. (West of Deepest Normal Point.) 
T,=5°743', c= 4°6280. 
Coefticients of L’(4°6230, z). 
Cc os ‘ =. Ba 
m |INaop | el~agen) | 88. Bie 
1 log ¢'|= 66492 66492 66492 
2 13115 ON a ee ‘78269 _°48166 
3 "2295 1:36078 14347 166635 
4 6147 1°78866 1:93213 1:33007 
5 ‘7688 T:88581 T:81794 1:11897 
6 8459 T:92732 1:74526 2°96711 
7 8899 T-94934 169460 384950 
§ | “9174 1:96256 1°65716 2°75407 
Value of L’'(4°6230, °25). 
B ry. 
n log a log 2” loge, He t 
0 | 1-00000 
1 66492 139794 | _'06286 1:15574 
2 48166 2-79588 | 1:27754 18947 
3 1°66635 3:19382 3°86017 ‘00725 
4| 433007 3:59176 792183 | -00084 
5 | 111897 798970 4-10867 00012(8) 
6 296711 438764 535475 00002(3) 
7} 3-84950 578558 | 6 -63508 -00000(4) 
8 275407 HalSso2° 1" i 9ato9 00000(09) 
Series error < 000002 119771 1:15574 
Hence L'(4:6230, -25) = + :04197. 
Calculating in the same way for z= ‘275 and z= 300, we get the following table :— 
z L'(c’, 2) Diff. 
"250 + 04197 ‘07289 
"275 — 03092 06847 
“300 — ‘09939 
Therefore 3% = 2644. 
3W, = °4712. 
3U, = 30°87 x 480,100 sq. ft. 
gt = lib x G92 Ott, 
