— 220 — 
an increasing deviation shows itself, lasting till 4^ p, being 
however mixted up at that time with a difference in the 
daily course by which the evening maximum occurred at a 
later hour than for the average monthly eurve. 
e only conelusion we can draw from these hourly values 
is, that we can associate with the eclipse some effect of 
westerly deviation of the needle, inereasing and decreasing 
with the obscuration. 
The amplitude of this deviation seems to have been 
between 0.5 and 1.'0. 
Total Eclipse of the Sun of December 12, 1871. 
Course of central line: Ceylon, Buitenzorg, North- Australia. 
Contact-times at Buitenzorg I 9" 6" a, IT 10^ 98" a, III 10^ 31"a 
and IV OP 5" p. 
Eye-readings of D have been taken at Buitenzorg and 
Batavia under the supervision of Berasma, who deals with 
them in this journal Vol. 33, 1873. 
In this paper Breresma comes to the conclusion that 
the observations did not show any magnetic effect to be 
associated with the total solar eclipse, looking apparently for 
larger effeets or sudden perturbations, but plotting the curve 
of the Buitenzorg-readings together with the one of the 
readings taken at Rocky Mount during the eclipse of May 28, 
1900, as was done first by Bauer, the similarity of the curves 
is surprising, giving a strong evidence as to the reality of 
the eclipse-effect. 
The effect at Buitenzorg was an easterly deflection before 
and a westerly one after totality. The range amounted to 0.7. 
I have plotted in the plate the curve of residuals as given 
by Beresma. 
