180 160 140 120 100 80x an 441 20 . 26 an an 80 100 120 140 181 
” 
Jou 
bp 
m 
OY 
: 
% to 
. 10 ve 
fs = 
2 
bP 
1 
% 
fa 
Fe 
Can 
= 
Note:- All Isotherms.are drawn to Sea Level Temperatures 
Gis 4 re i -de we el 
180 160 140 120 100 80 80 40 20 Q 20 40 60 80 100 120 140 + 
rm Er — rmm— Eth — EE _ g— — - - TT mea a  —— 
Gallls Projection W. & A K Johnston Limited Edinburéh