METAL POT
The metal pot consists of the pot jacket and pot crucible. The jacket is the outside casting. The crucible fits into the jacket, allowing space between the crucible and jacket for asbestos packing. The crucible is held in place in the jacket by three lugs, which keep it stationary in the jacket. All the space between the crucible and jacket is packed tightly with powdered asbestos which has been mixed with a little water until a paste is formed. This insulation is for the purpose of holding the heat in the crucible.
It is very important that every pot should be well insulated or packed. If there is poor packing the crucible can not hold the heat. The result being poor slugs, and the consequent use of more gas than is necessary. If the machine takes an excessive gas flame to keep the metal in working condition, look for poor insulation.
The well of the pot, which contains the metal before it is forced through the mouthpiece by the plunger, must have sufficient metal under the plunger to form a perfect slug when a cast is made. For that reason two holes are drilled in the well, one on each side, which allows the metal to enter the well. If the holes become closed, which they sometimes do if the well is not cleaned regularly, the slug will be hollow. They should be kept open, using the end of the mouthpiece wiper, which is bent at a right angle and pointed. The metal pot has a capacity of 38 pounds of metal.