1. Starting the fire

Make an intense fire using kindling and small sticks.  Allow air to enter the kiln from the bottom to facilitate starting the fire. When fire is burning
well, seal the bottom of the kiln with dirt so that no air enters from the bottom perimeter.

2. Adding material

Add larger pieces no bigger than 12 inches in diameter, gradually filling the cylinder with burning/ burned coals.  It is time to add more fuel when the previous charge is black and beginning to show grey ash.  Continue adding fuel until the kiln is full of char or you run out of fuel or time.

As the level of charred wood rises in the cylinder, the lower level of the outside of the cylinder should be cooler than the area of active burning, indicating that no oxygen is entering the kiln from below.