How to make charcoal in a home made retort

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An in-depth explanation of how to make top-quality charcoal/biochar using a home-made retort made out of two old gas bottles. After much experimentation I've discovered this is the best and fastest method to make the best charcoal first time every time.

The plan is eventually to use the charcoal in a charcoal gasifier to power a vintage stationary engine ... https://www.youtube.com/watch?v=cxELU3BpusM

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