The Voyage of HM.S "ClLallerLger." 



Plate II 



MAP SHOWING the APPROXIMATE DISTRIBUTION of the SECULAR CHANGEinthk DECIINATION. >r VARIATION.- EPOCH 1840 1880. 



CompiledVE^C^ 



The arrows defected to the right of the true meruliaJi indicate 



Hie Hlacli ctwi' 



EXPLANATION. 



mn.-.ra m wluch tile North seeking endof the needle Is moling Eastward Arrows deflected to. the left that it IS movuu, Westward 

 11 Liu? BLack curves pass through regions of no Secular change in t/te Declination 



\_) Indicate foot of majzmum. Secular change, the figures giving the annual value. The arrow on tlie circle the directum in which the needle is moving 

 @Arefoct ofmoiimum Secular cluing.. „, the Inclination., I + *■•""*•■* that >!'" *»** scelang end of the needle moved downwards, 

 the figures giving the annual value. ) - Signijies that the north seeking end ot the needle moved upwards . 



Engraved- ty Malty & Sons 



