How to make real fired bricks with nothing but mud and fire.
Day 17 in Tollan. To get the iron out, you had to break your furnace open. So you need a furnace that lasts, and that means bricks. Why not just stack river stones? Wet stones can crack, or even burst, in a fire.
1. The clay: mix about one part sand to two parts clay, and stomp it smooth.
2. The mold: a wooden frame with no bottom, wet and dusted with sand. Throw the clay in hard, scrape it flat, lift the frame off. About sixty bricks.
3. Drying: about a week in the shade, turned on their sides.
4. Firing: stack them with finger-wide gaps, leave tunnels for the fire, plaster the outside with mud. Start with a small fire overnight, then feed it hot all day until the stack glows. Let it cool for two days.
A good brick rings when you tap it. A few will crack, and that's normal.
And across the river, they're getting closer...
Episode 12 of Isekai Engineer: Fantasy Survival Guides.
Missed Episode 11? Watch how to forge an iron knife first.
Next episode: How to Build a Reusable Furnace.
All my links: https://isekaiengineer.com
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