Primitive Technology: Pit and chimney furnace

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Published 2018-12-16
Primitive Technology: Pit and chimney furnace - Creating a pit and chimney furnace from scratch.
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About this video:
While I’m working on other projects I’ll put up this video of an experimental furnace I built that operates by natural draft and uses charcoal as a fuel. The furnace burns the fuel on a grate for maximum area of air entry. The chimney attached to the furnace is 2 m tall above ground level. The pit is 25 cm cubed and extends below ground level. The whole structure took about 2 weeks to build.
A brick of iron oxide (from iron bacteria) mixed with charcoal powder was made and placed in the furnace sitting on a grate about 12.5 cm tall. The furnace was lit with wood and fired. Charcoal was added after this point and a high temperature was reached. The ore brick melted and produced some tiny beads of cast iron.
In contrast to the other furnace I made in the previous video, this one produced less iron while consuming the same amount of charcoal. I’d actually built this furnace before the previous video in an attempt to reduce labour by having a tall draft chimney replace the work and complexity involved with using a blower. I’ll keep experimenting with natural draft furnaces, the principle is sound but the method of introducing the ore (batches of ore on a grate instead of continuous addition of ore pellets) is probably inefficient or could be improved on.

About Primitive Technology:
Primitive technology is a hobby where you build things in the wild completely from scratch using no modern tools or materials. These are the strict rules: If you want a fire, use a fire stick - An axe, pick up a stone and shape it - A hut, build one from trees, mud, rocks etc. The challenge is seeing how far you can go without utilizing modern technology. I do not live in the wild, but enjoy building shelter, tools, and more, only utilizing natural materials. To find specific videos, visit my playlist tab for building videos focused on pyrotechnology, shelter, weapons, food & agriculture, tools & machines, and weaving & fiber.

All Comments (21)
  • I've posted photos of the iron prills that I melted together in a crucible to form a single ingot (it's in my community tab here: www.youtube.com/channel/UCAL3JXZSzSm8AlZyD3nQdBA/c… .This was done using the forge blower blasting air down onto the crucible covered with charcoal in a small furnace. It is indeed iron metal as it sticks strongly to a magnet and has a shiny metallic luster. I believe it to be cast iron as it is quite brittle, though in other experiments I've made malleable iron from the same iron bacteria which could be flattened when hammered cold. Thanks.
  • @GeneralGravys
    I've always loved how charcoal sounds when digging through it. Like a mix of dry leaves and broken glass lol.
  • @bladudemovies
    P.T. was the only good part of YouTube Rewind 2018.
  • There are two types of primitive technology channels. Ones who specialize in making furnaces and others who build pools Edit: ugh, just noticed that my comment is on top. Yeah, guys, completely agree, this dude is first to introduce this wonderful survival techniques, especially the ones that really matter.
  • @Case1113
    I love how he looks completely fine when destroying something he worked hard for.
  • @jettthorp9444
    Honestly the greatest part of YouTube Rewind was Primitive Tech. Glad to see some recognition for one of the best channels on YouTube, and I’m glad they didn’t ruin the moment with upbeat music. Keep doing what you’re doing 👍
  • @jd5179
    Give this man an eternal life , 3000 years later - dude is building a spaceship
  • I always used little sticks as a support for bridging gaps when I was building sand castles as a kid. Goes to show that there are just fundamental ways to do things. Really makes me smile when I see this trick in your videos, because it takes me back to my childhood.
  • Can we all agree that prim tech was the best part of YouTube rewind?
  • You are very soothing to watch. Calming... You can have a clouded mind, filled with all sort of thoughts, but just a minute or two of watching you in action and the storm clouds go away, the sun comes out and all is peaceful again. Thank you for your videos, David.
  • Anybody else ever wonder why, when you were a your kid, it was so satisfying to play in the mud making weird shit? ..Instincts
  • @TweeklyLOVER
    From what I learned in Microbiology Class in University iron bacteria live on iron-rich surfaces. They wouldn't contain much iron themselves because the uptake has to be strictly regulated (iron in high doses is poisonous). I would recommend using the bacteria as an indicator, not a source. So you should focus on taking the rock and mud the bacteria are living on. Hope this might help. Really enjoy your content.
  • @BallisticApe
    Hey mate just letting you know that this premiere feature is known to butcher your views and watch time after it “uploads”. People have reported a significant decrease compared to their normal uploads.
  • @SnowKat-mn9qh
    One of my dreams in life is to go to Australia and meet this guy. I’m fascinated by this kind of thing and I would love to go there and be able to see his projects in person. Heck, I wouldn’t even care if I had to do something menial like collect fire wood or weave baskets, if I got the opportunity to help I would totally accept. It’s a random dream and I’m positive it’ll never get fulfilled (especially considering I live on the other side of the world and I don’t even know this person), but it’s fun to think about C:
  • @santig8521
    Comes back 10 years later: Alright Mom, I’m done playing outside!
  • @Cardo2004
    There’s so many of these “primitive” you tubers now copying ur content, u shall always be the real primitive YouTuber tho🥇
  • @InvictusByz
    Just a friendly reminder to everyone; Primitive Technology's video's are closed captioned with descriptions of his work. Press "C" on desktop to quickly turn them on.
  • @kelleyhyde643
    These videos are so refreshing, I can learn things from them, most other "diy" videos either have a babbling narrator or blasting music...this guy with no shoes just nicely shows us how to do something for ourselves😎