526 GEOLOGY OF OHIO. 
Figure LY. 
Charger, with Sliding Doors. 
Weimer Machine Works Company, Lebanon, Penna. 
The method of taking the gases from the top of the furnace is 
almost invariably the simple plan of one or more openings in the side of 
the furnace, connected with a large wrought-iron pipe lined with fire- 
brick, and known as a down-cast or down-comer pipe. None of the 
more elaborate methods of taking gases from the center of the throat are 
in use in the State. The top of the coke and raw coal furnaces are in- 
variably closed by a simple bell and cone, the same plan being used 
throughout the State. There have been until recently one or two fur- 
naces at Massillon provided with a brick tunnel head and open throat ; 
but the simple cup and cone is at present the universal practice. The 
methods of lowering the cone are in the first place, and most generally, a 
hand arrangement, by which the lever supporting the cone is raised and 
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