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MESSRS. R. S. HUTTON AND J. E. PETAVEL ON ELECTRIC 



a feed of 8 inches. To obviate any risk of damage to the main forging by contact 

 with the hot furnace materials, a cast-iron lining L was always used. 



When in a horizontal position the furnace rests on four cast-iron feet (not shown in 

 the figure). When vertical it is supported by the cover of the water jacket, the 

 lower carbon feeder passing through a hole cut in a massive wooden stand. 



Fig. 2. 



Sc*ic IN INCHES 



Transverse section through the centre of the large furnace. 



W. Water jacket. 



F. Main forging. 



L. Cast-iron lining. 



The inlet valve is screwed into A, whereas the openings B and C receive the windows shown in 

 fig. 4, outlet valves and gauge connections, or, when required, auxiliary insulated 

 terminals. 



The main forging is provided with three openings, as shown in fig. 2, which is 

 a section through the centre of the furnace perpendicular to the axis of the carbons. 



The aperture A served to receive the valve through which the enclosure was filled 

 with compressed gas, whereas in most cases one of the windows shown in fig. 4 was 

 screwed into B. The third opening was connected to a pressure gauge and served 

 also, when desired, for the escape of the gaseous products of reaction. 



Carbon Feeding Mechanism. 



This is shown in detail in fig. 3. A ring B is fitted to each of the projeptions K of 

 the furnace. To this ring the small cover A is bolted. The joint is made, as in the 

 case of the main furnace cover, by means of the lead-packed spigot V. The cover 



