it further than from B, though placed at equal distances.] 

 Thus upon the principle that he had asserted, the B iron, 

 which fetched the highest price in the market, and which 

 cost more in the manufacturing, appeared, from its greater 

 neutralizing effect on the magnet, to be a more perfect quality 

 of iron, to have less crude matter in it, or to be more purely 

 ferruginous than the other. For, just as he had anticipated, 

 the bar B proved to have higher capabilities of magnetic 

 influence than the bar L. In order to ascertain this more 

 conclusively, he had got half-a-dozen plates of each kind of 

 iron made, so as to get a mean result, which would be more 

 accurate than that obtained from a single specimen. To 

 illustrate his jnethod of determining the capacity of the 

 several plates of iron for magnetism, as shown by their 

 respective neutralizing action on the steel magnet of like 

 dimensions, the Rev. gentleman showed that the action of the 

 magnet alone upon the compass, at the distance of 15 inches, 

 produced a deviation in the needle from the proper meridian 

 of about 20 degrees, or two such magnets together of 31 

 degrees 15 minutes. Having, with the series of iron plates 

 kindly furnished him by the managers of the Bowling Works, 

 placed each of them in succession betwixt a pair of small 

 magnetic steel plates, he found the average effect at the same 

 precise distance to be, that the plates L reduced the action 

 of the magnets on the compass to 8 degrees 21 minutes, and 

 the plates B to 6 degrees 45 minutes; so that the mean 

 reduction of power (the measure of the magnetic capacity) 

 by L was 31 degrees 15 minutes — 8 degrees 25 minutes=22 

 degrees 50 minutes; and by B was 31 degrees 15 minutes — 

 6 degrees 45 minutes=24 degrees 30 minutes. Thus show- 

 ing that the best iron had decidedly the highest magnetic 

 capacity, and that the magnetic capacity of each kind had an 

 analogous relation to the respective values of these two 

 articles in commerce. 



