And if you have enough breath for a prayer, put it to better use by blowing into the firebox.
The ends of the fuses were hidden by the tinder of the fuel in the firebox.
There is a heavy hand-hewn stone sink and a copper caldron with its own firebox and ashpit.
No piece larger than a mans fist should be put in a firebox.
Regulate the fire by the damper alone, never opening the firebox door even if the fire gets too hot.
The straw burners are provided with a firebrick arch in the firebox.
In a locomotive boiler the mud accumulates in the water leg, below the firebox.
He sped not only with the firebox open but with the forced draught.
So it follows that flues, being thinner, are better conductors than the sides of the firebox.
The short legs of the pan rested on the red-hot coals in the firebox, while the cover was always within reach.