Mr Ba-r]o\v'’s Discoveries on the Magnetism Hot Iron. 
peratuie will be diminished by the correction due to the height 
of Oxford above the level of the sea. 
in the above 
are the q^uantities of 
Rain that fell 
a r 
1816, 
Inches^ 
24.328 
1817, 
19.260 
1818, 
23.077 
1819, 
21.156 
1820, 
17.757 
1821, 
25.110 
Mean Quantity of Rain 
for Six Years, 
1 21.781 Inches.' 
The funnel wliich receives the rain is on the roof of the eastern 
wing of the Observatory, and is about SO feet above the ground. 
Art. XXIII . — Notice respecting Mr Barlow’s New Discove- 
ries on the Magnetism of Red Hot Iron, ^c. 
M R Barlow of the Royal Military Academy, in the prose- 
cution of the magnetical experiments in which he has been for 
some time engaged, has discovered another curious property, 
which deserves to be recorded. 
The first object of these experiments appears to have been to 
determine the relative magnetic power of different kinds of iron 
and steel on the needle, and his results, as connected with this 
determination, are as 
follows, viz. 
Pro, Power. 
Pro. Power. 
Malleable Iron, 
100 
Shear Steel, soft. 
- 
66 
Cast-Steel, soft, 
74 
Ditto, hard. 
- 
53 
Blistered Steel, soft. 
- 67 
Blistered Steel, hard. 
- 
53 
Cast-Steel, hard. 
49 
Cast-Iron, 
- 
84 
That is, the above numbers express the relative powers of these 
different metals in deflecting a magnetised needle from its natu- 
ral direction. Seeing that the hardest iron and steel had the 
least power, Mr Barlow was next desirous of ascertaining what 
this comparative power might be, when heated in a furnace, and 
while each of the different specimens were thus rendered soft. 
The results in these experiments are not so uniform as in 
the preceding. It is remarkable, however, that the malleadle 
