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METHODS FOR WORKING HOT BLAST STOVES.
The short duration of the brick stove being- "in blast " is due to the rapidity with which the introduction of cold air abstracts heat from the brick work. The temperature of a brick stove decreases from 100 to 300 degrees F. in one hour's time. With the plan
FIG. 15.— IRON HOT BLAST STOVE.
of stove shown at Fig. 14 four stoves are required to keep a furnace steadily in blast. Of the four stoves, only one is generally in blast, although two may run together for the whole of one turn of the stoves. The plan generally followed is to "put on" the stove goingstove can run steadily, whereas the1 brick stove