FURNACE REACTIONS UNDER HIGH GASEOUS PRESSURES. 



carries two columns Ci, C a surmounted by a yoke Y which is insulated from them by 

 micanite bushes and washers II. To this yoke 'the main terminals (not shown in the 

 figure) are fixed. The nut N is revolved by means of steel levers inserted in the 

 holes T, and thus the feeding rod S is moved forward. The feather F fits in a groove 

 cut in this rod and prevents it following the rotary motion of the nut. 



Fig. 3. Carbon feeding mechanism of the large furnace. 



The email cover A is bolted down to the ring B, which is fitted on to the projection K, forming 



part of the main forging. 

 Two columns, Ci, C->, support the insulated yoke Y, in which the nut N is revolved by steel 



levers fitting into TI and T 2 . 

 A stream of water flows through the hollow feeding rod S, the nipples I and carrying the 



inlet and outlet pipes. A central pipe can be used to pass a flow of compressed gas 



through the axis of the electrode M. 



The glands Q of the stuffing box P are electrically insulated from the cover A. 

 The electrode M is soldered into the cup-shaped holder H which screws on to the end of the 



feeding rod. 



The feeding rod passes into the furnace through the insulated stuffing box P. 



This stuffing box serves the double purpose of making a gas-tight joint and 

 providing insulation sufficiently perfect for the relatively low electromotive force 

 which is generally required with this furnace. As packing, a mixture of asbestos and 

 tallow is used, which in itself assists the insulation. 



The stuffing box is compressed by means of the ring D, which presses on the gland 

 Q, but is electrically insulated from it by mica washers and bushes. The inner gland is 

 insulated iu a similar manner from the steel cover. 



The feeding rod is hollow. The current of water passes into it at I, and flowing 

 through an inner brass tube is delivered at the extremity of the rod and passes back 

 to the outlet O. A gas connection G is also provided by means of which compressed 

 gas can, when necessary, be passed directly into the centre of the furnace through the 

 axis of a hollow electrode (M). 



VOL. ccvii. A. 3 I 



