continue to do so inthe working of the furnace, keeping out the cold air as muchas possible. Keep the furnace door open no longer than isabsolutely necessary, and place your coaj before firing near tothe furnace, that there may be no loss of time in chargingthe fire ; all cold air ooming in contact… … represent the sides of the fires last stoked, and the gas givenout from the new fuel mixing with the air which passes inthe greatest quantity through the thin portion of the fire, asindicated by the arrows. Being thus mixed with air at ahigh temperature, the gases ignite, and comparativelythorough…
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