The coal box _C_ is to the right, where it is convenient. The coal should always be dampened with water to prevent the fire from spreading. This will produce a more intense and more concentrated heat, so that a certain part of the metal can be heated without danger of affecting the rest.
[Illustration: FIG. 2.—A MANUAL TRAINING FORGE.]
The water tub, or slack tub _D_, as it is more properly called, stands at the right of the forge near the coal box, where the water for dampening the coal can be most readily obtained. It is used for cooling the iron or tongs and for tempering tools.
Modern forges are made of cast iron or sheet steel. There are various kinds designed mostly for special purposes. They are generally used with the fan blast instead of the bellows and have a suction fan for withdrawing the smoke.
The forge illustrated in Fig. 2 was designed for manual training use and is excellent for such a purpose. The bottom or base has six drawers which provide convenient places for keeping exercises and individual tools. As each drawer is provided with a special lock, much of the trouble resulting from having the tools or the work mislaid or lost is prevented.
[Illustration: FIG. 3.—SECTIONAL VIEW OF THE FORGE SHOWN IN FIG. 2.]
The hearth _A_ where the fire is built is provided with a cast-iron fire pot or tuyère. This is constructed with an opening at the bottom where there is a triangular tumbler which is cast upon a rod projecting through the front of the forge; by revolving the rod and tumbler the cinders or ashes can be dropped into the ash drawer at the bottom of the forge without disturbing the fire. A sectional view of these parts is shown in Fig. 3, also the valve which regulates the blast.
Suspended on the upper edge surrounding the hearth, and located to the right and left of the operator, two boxes _C_ and _D_ are located, which are used for storing an adequate supply of coal and water, where they may be conveniently obtained.
In front are two handles; the upper one operates the clinker or ash valve, the lower one regulates the blast.
The front and back edges surrounding the hearth are cut out, so that long pieces of metal can be laid down in the fire. These openings can be closed, when desired, with the hinged slides shown at _G_.