262 HISTORY OF TilE GRANGE MOVEMENT; OR, 



INTERIOR OF A COAL MINE. 



the products of the immense magnetic iron ore deposits 

 of Cornwall, the largest unbroken mass of ore known, 

 to the business of this branch. 



" The Broad Mountain, dividing the two coal-fields, 

 is crossed by the different branches at four different 

 points, three of which lead directly into the Mahanoy 

 coal-field and one into the Wiconisco basin. The ascent 

 from the southern side is by steep but practicable 

 gradients, but the descent of the above points is by 

 means of inclined planes, the steepest of which, the 

 Mahanoy plane, has a gradient of 22 feet per 100 feet 

 and is & mile in length. 



