silicon nitride ceramic plate kmart sold on ebay
Supco SSN4000 Silicon Nitride Universal Furnace ... - 2019-7-4 · USA Copper Spinning Top: a ceramic silicon nitride sphere is precisely placed at the center of mass allowing this copper plate of the US to spin like a top. Stamped out of heavy 1/8 inch thick copper, spin times up to 4 minutes can be achieved. More physics magic by @shirepostmint !
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