Today(Apr.13) is the 3rd day of Shiho's firing. Before everything, I would like to explain about the outline of Shiho's firing. Shiho always has over ten-day firing. The longest one was fifteen-day firing. Ten-day firing is planned this time. We need about 20 tons firewoods for it. You can see the 20 tons firewoods on this photo. We will be burning all of these firewoods. We have to take the firewoods to the kiln, and also we have to chop them while having a firing. We have stoking the firewoods and other much works.
We burn the firewoods in the undermouth from the start to the evening of the second day. After we were burning the firewoods in the undermouth over 24 hours, the temperature of kiln will stagnate. At this time, the temperature reached about 400 centigrade. We moved from the undermouth to the upper mouth and closed the undermouth with fire bricks. And we made an air hole at the center of the undermouth. The size of the hole is difference according to the weather, air condition and so on. This decision is one of the most important thing.
After we moved to upper mouth, we stoke three armful of firewood into the kiln. Around this time, all clay works are very weak. So we stoke the firewood carefully. Don't hit the firewood to my works.
I took this photo at 16:00 of the third day. The temperature is about 850 centigrade. Shiho doesn't use a thermometer. So I have to see the feature of fire flame coming from the chimney and spy hole.
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