248 PECULIARITIES IN THE MAGNETISM 
magnetic action, would then begin to be mani- 
fested, and the needle would travel rapidly to its 
ultimate position.* 
86. I have anxiously watched for the pheno- 
menon alluded to, during the progress of several 
of the experiments already detailed, but in no 
instance have I been enabled to detect it. Mr. 
Fothergill, however, to whom I made known my 
object, has informed me that he observed it, in 
an experiment carried on by himself, in my 
absence. 
87. “The only explanation” says Mr. Barlow, 
“which seems to present itself of the cause of 
this anomalous action, is that, the bar cooling 
faster at its extremities than at its centre, one 
part of it becomes magnetic before the other, and 
hence gives rise to the irregular action above 
indicated. It must be acknowledged, however, 
that this explanation does not meet entirely all the 
phenomena recorded in the preceding table.” t 
* Barlow’s “Magnetic Attractions,” second Edition. 1823. 
Page 146. 
+ The table alluded to is a table of the results of an exten- 
sive series of experiments; in many of which the anomaly 
in question presented itself. 
