SELF-PACKING VULCANITE APPARATUS. 



305 



cylinder. [The cylinder which was to hold the 

 charge was then passed round.] The object here 



Fig. B. 



A B. Iron frame, held in a bench-vice, for holding the various parts of packing 

 apparatus, 



C. Cylinder with steam-jacket, connected to AB by a swivel joint. 



D. Plunger, connected to screw EE by a brass joint. 

 F. Handle for forcing-in plunger D into cylinder C. 



G H. Turn-plate and screw, for holding flask firmly in contact with cylinder C. 



1. Copper boiler, connected with steam-jacket of cylinder C by flexible tube. 



2. Gas-stand for boiler. 



3. Ooen fitting to gas-stand for melting off wax. 



4. Receptacle for melted wax running from flask to place within the oven 3. 



is to syringe in softened vulcanite into the space 

 which was previously occupied by the wax model. 

 Although the importance of saving a little time 

 is not very great, the most important advantage 

 that I find in this process is the non-separation of 

 the flask, the teeth remaining in their relative 

 positions to the surface they are to occupy, and 



X 



