MEAN TEMPERATURE OF THE OCEA 
HM.S '’hallcngi 
' ll 1 ' " 
7 
f 
^ I SOTHERMAL LINES 
SIIOWI>'(; TIIF- MKAN TKMI'KKATnKF (FAH'.‘ 
Ol- TMK or KAN AT 
DEPTH OF 700 FATHOMS 
^ v; 
/■' rA/y th>nrr* tn fhl/r. 
Track of U.M.S.Clial 
