Connect the reversed vacuum to a power source or connect the hose and the glass funnel to an air supply. For a large class, this demo can be done with the plastic funnel and vacuum. For a small class, ...

Remove funnel. Swirl the glitter around ... They also have clear glass ornaments. These glittered glass ornaments are quick, easy, and inexpensive to make. They run about $1 each and take less ...

The Tektronix ceramic CRT molds underneath Building 13. The advantages of ceramic funnels over glass ones are many, including the former being much harder and resilient to impact forces ...