They are made out of different materials depending on the application. Can use ordinary cast steel if you are pouring brass, aluminum, lead or Babbitt. For steel , on the high end, they be graphite , platinum, or combination of both. In Pakistan though, just ordinary fire clay that is good for a few pours, then make a new one. Obviously, they are very dangerous when they start deteriorating. I dont know if the crucible itself was ever made of plaster, but if you were building a home made furnace, you could definitely line the inside and the lid with plaster.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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