or arches into several narrow ones, both for convenience and economy in firing. Wide furnaces have sometimes been di videdin this manner, after the boilers were set, producing a considerable gain of efficiency. The arrangement of the boiler front fixes the position of the grates, or their distance… … It is obvious that the iron front can be dispensed with, if desired, and the boiler sustained on brickwork alone. This is quite frequently done, but the plan does not appear to pos- sess any special advantages, since, if the setting is proper- ly performed, it will be quite as expensive as if the…
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