Electrical products Carborundum. 



first taken into the rooms where are stored the 

 crude material, the sand, coke, sawdust and 

 salt. The sand is of the finest quality and 

 very white. The coke is first crushed and 

 screened, the part which is reduced to suffi- 

 cient fineness is mixed by machinery with the 

 right proportion of sand, salt and sawdust. 

 The coarser pieces of coke are used for what 

 is called the core of the furnace, which will be 

 described later on. 



This mixture is carried to the furnace- 

 room, which has a capacity for ten furnaces, 

 but not all of these will be found in operation 

 at one time. Here the workmen will be taking 

 the manufactured material from a furnace 

 that has been completed, and there another 

 furnace is in process of construction, while a 

 third is under full heat, so that one sees the 

 whole process at a glance. These furnaces are 

 built of brick, about sixteen feet in length and 

 about five feet in width and depth. The ends 

 and bed of the furnace are built of brick, and 

 might be called stationary structures. The 

 are also built of brick laid up loosely 

 without mortar; each time the material is 

 placed in the furnace, and each time the fur- 

 nace is emptied, the side-walls are taken 

 down. 



A furnace is made ready for firing by 

 plafh - <>f tin- mixlurr on tin- hotloin, 



and building tin- -i<l< - up about four feet 



