Now blacken the stove. Begin at front of range, and work towards the back; as the iron heats, a good polish may be obtained. When the wood is thoroughly kindled, add more coal. A blue flame will soon appear, which is the gas (CO) in the coal burning to carbon dioxide (CO2), when the blue flame changes to a white flame; then the oven-damper should be closed. In a few moments the front damper may be nearly closed, leaving space to admit sufficient oxygen to feed the fire. It is sometimes forgotten that oxygen is necessary to keep a fire burning. As soon as the coal is well ignited, half close the chimney-damper, unless the draft be very poor.
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