Tke "Voyage of HM.S “CliaHeiig'er'’ 
MEAN TEMPERATURE OF THE OCEAN 
ISOTHERMAL LINES 
SHOWING THE MEAN TEMPERATURE ( EAH R j 
OF THE OCEAN AT 
DEPTH OF 1500 FATHOMS r 
A Pm oh am Delt- 
Isothermals above Average shown, in. Red, th 
! 
>• _: 
.. a 
* Sr*. / 
F(\ - . M--: 
