DnTKSL\L V.ARLATIONS OF TBE ™TICAL COMPONENT OF MAGNETIC FORCE AS MAKERSTOTJN 1843-184-6. 
Irans.Ro!). SocEdiji. Vol.JU.J'ajtK Plate W. 
AM 
PM 
AM 
r > 
^^-4 ?—J f ? t~JS-^ ^ ^ 3 i 5 6 7 8 9 JO Jl 12 123i567B9 10Jl O 
Dec. Feh. 
Mar._ Apr. 
May.^June 
J III; I. Aug. 
Sept. ^ Nov. 
Sept. Feb. 
Mar.^Aug. 
Tear 
Mean 
Mean 
Mean 
IMean 
Mean, 
Mean 
Mean 
Mean 
Positive Ordinntes indicate increasing Vertical Force. Scale, lDiv = 0-0001;Vert.Force=I. 
— Mean of all. ■■■-./""''■■ Mean of undistiirlied daiis. 
f.'n<i''l>i/ ('i-<^..Iilmutn 
