To bank a fire in a furnace, push the fire in a heap at the back of the
furnace against the flue sheet; leaving a large portion of the grate
open, to allow the air caused by the natural draught to pass up over
the fire to the flues; then cover it over with fine coal or a layer of
dry ashes, and see that the draught door is closed to prevent draught
as much as possible.
This being done, the fire will last over night, and when ready to start
again in the morning, all that is necessary to do is to rake the fire
over the grates, open the damper and apply more fuel.
Q. What benefit is derived from banking the fire?
A. By banking the fire, the water in the boiler is kept warm over night
and steam is raised quickly in the morning, saving time and fuel.
Q. When leaving a banked fire, is it practicable to shut the water out
of the glass or water column?
A. Yes. In freezing weather, this may be done by closing the valve at
the top and bottom of the glass; and open pet cock beneath. Care should
be taken, however, to open them before the fire is started in the
morning.