[ 19° ] 



if one of them be more powerful than the other it will increafc 

 the magnetic difpofition, and confequently the power of the 

 weaker. 



Soft iron, as its parts are moft eafily moved, receives the mag- 

 netic difpofition mofl eafily, hard iron or tempered fteel more 

 difficultly, and cq/i iron, as being both hard and abounding in 

 the heterogeneous particles, moft difficultly and imperfedly. 



Whatever way iron is applied to a magnet the magnetic 

 power is difFufed in the direction of its length. Hence it 

 fhould feem that when a bar of iron is laid on a magnet the 

 contiguous ends of the iron become poles of the fame name with 

 thofe of the magnet to which they are contiguous, and hence 

 may be derived the power of armed magnet!^ for the furfaces of 

 the armour immediately beneath thofe of the magnet imprefs a 

 dired;ion oppofite to their own on thofe of the magnet, and 

 confcquently redlify fuch furfaces of the magnet as may have 

 been inaccurately direded, and thus ftrengthen it. 



To communicate the magnetic power to iron by fridlion 

 againft a magnet, it is neceflTary that its pole fliould Aide along 

 the magnet fcveral times in the fame diredlion, for if the direc- 

 tions be alternately oppofed the powers received will fucceffively 

 deftroy each other. 



A sYNONiMous pole is formed at the end at which the fridion 



begins, to that of the magnet applied, and an oppofite at that 



at which it terminates. 



Appropriation 



