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  • schoolie 2:16 pm on October 11, 2012 Permalink | Reply
    Tags: , giant fresnel lens, magnesium ignition, , thermite   

    Giant Fresnel Lens, Magnesium, and a little bit of Thermite 

    My friend’s old big screen projection TV died, and he gave me the screen from it.  The neat thing about big screen TVs is that one layer of their screens is a Fresnel Lens.  People have used these for starting fires and lots of other stuff, and we figured we’d join in.  Ben wanted to try making thermite, so we decided to try using the Fresnel Lens as the ignition source.  After making a crude frame and lining it up with the sun, we were able to light magnesium (from the lower casting of a broken mountain bike fork) on fire quickly and easily.  According to Wikipedia, Magnesium’s autoignition temperature is 883F!

    The thermite was home made, thrown together the night before from rust powder from an old bucket of metal junk and aluminum shavings made with a hacksaw.  We didn’t have much success actually lighting the thermite, but we did manage to get a couple tiny blobs of molten iron.

    We did this at the end of May 2012, here’s the video:

    • schoolie 3:44 pm on October 11, 2012 Permalink | Reply

      I love how fast our excitement about lighting the magnesium faded into disappointment that the thermite wasn’t working 🙂

    • littleschoolie 1:40 pm on October 20, 2012 Permalink | Reply

      We definitely need to start cutting the audio on these things… 😉

      • schoolie 9:50 pm on October 20, 2012 Permalink | Reply

        Haha, I thought that was the best part! We were screaming like little girls when it first lit, lol.

  • schoolie 8:03 am on September 9, 2012 Permalink | Reply
    Tags: , , thermite   

    Ben's birthday present 

    Here’s the video of the first thermite test. Molten iron!

    This was early August 2012. We bought the aluminum powder and iron oxide from Skylighter, an online fireworks supply company. We bought 2 pounds of aluminum, so there’s a whole lot more where this came from!

    • littleschoolie 8:34 am on September 9, 2012 Permalink | Reply

      The sheep definitely makes it… 😉 I saw the “Leg up” video in the related videos, you oughtta post that as well.

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