AT MUNICH, 1840, 1841, 1842. 619 
According to Mr. Lloyd’s hypothesis it would have been 
p= + 0:04053 
g = — 03237, 
values which are wholly irreconcilable with the series of experi- 
ments. 
It is not however exactly necessary to the success of the me- 
thod given by Mr. Lloyd that the calculated values of p and q¢ 
should be the true ones, but only that they should be in certain 
ratios to the true values. In order to decide whether for magnets 
_ of equal dimensions equal coefficients apply, I have made the 
following experiments with two small bars of equal size, &c., 
and magnetised in the same manner. The determinations are 
the mean of two series of observations in each deflection; the 
four angles were read; the distances I. and II. are to each 
other as 3:8. 
Value of log e€* sin $. 
Distance. Magnet A. Magnet B. 
Re feleci» COD IOO) eii.s elie oo GLOGS 
My Sse oe -G44OU! oF. BK... 644473 
We see that it is out of the question to apply the same values 
of p and g for both cases; it is needful therefore to determine 
them by observations for each single magnet, and they cannot 
be calculated from the dimensions. 
It may perhaps be useful to subjoin one more remark on the 
experiments adduced by Mr. Lloyd to prove the correctness of 
the assumed law. His series II. gives 
M p ! 
wish aie eee is 
1: 4 
f U 
= 9520444440 
/ 
952966 + 2+ 2 
7 O52 + D583 
as p' and q’' have different signs, we may make 
p=ntmg=—m, 
and we then have 
log 2 = 9°52247 + n0°444 + m0-246 
= 952244 + n0°250 + m0'188 
= 9°52266 + n0°160 + m0'134. 
