304 



SELF-PACKING VULCANITE APPARATUS. 



force from parting the two halves of the flask. 

 The flask is now heated in a suitable oven (3, 



yiG. A. 



g. Lid of flask, perforated. 



e. Lower piece of clamp, with three jointed arms. 



f. Upper piece of clamp, with hole in the centre to fit g. « 

 k. Flask, enclosed between the pieces e andf. 



i. Stopper made to fit orifice in lid g. 



h. Flask, with stopper i, disconnected from clamp e, f, and held firm by ordinary 

 stirrup clamp. 



Fig. B), in such a position as to allow the wax to 

 run out ; a suitable vessel (4) of course being 

 placed beneath it to receive the melted wax. In 

 this state it is ready to receive the charge of 

 rubber. I have omitted to mention that as soon 

 as the heat has penetrated the flask, while in the 

 oven, the two side wires must be withdrawn. It 

 is now ready to be adjusted to the apparatus. I 

 will show immediately the mode of heating the 



