How to build a brick furnace you can use again and again.
Day 28 in Tollan. You have sixty fired bricks. Your first idea is to stack them dry, like blocks in a game. But air leaks out of every gap, and the fire never gets hot.
1. Mortar: two parts clay to one part sand, like thick porridge.
2. Wet each brick first, so it doesn't suck the mortar dry.
3. Build the ring, each brick over the joint below it. Arch the doorway over a bent green stick, and leave a hole for the air pipe.
4. Line the inside with clay as thick as your thumb.
5. Close the door with loose bricks and a smear of mud.
6. Dry it with a small fire overnight.
When the smelt is done, don't smash anything. Pull out the door bricks and drag the iron out. Patch the lining, brick the door back up, and it's ready again.
And three ridges away, someone has spotted his fire...
Episode 13 of Isekai Engineer: Fantasy Survival Guides.
Missed Episode 12? Watch how to make bricks first.
Next episode: How to Forge an Iron Axe.
All my links: https://isekaiengineer.com
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