This prototype was done by an Engineering Student from Oregon State University.. When he fired it up, it shorted the electrical circuit and he wasn't able to fully demonstrate it.

Air Popcorn Popper with Tin Can
The roasted coffee beans made with this piece of equipment won 1st place in a cupping by three professional coffee tasters.

This one really drew attention as he had a hot fire going and he wore fireman gear with roasting. This gentlemen won 2nd place in the cupping contest.

Cast-Iron Fry Pan Method

I took a series of 18 photos showing the start to the finish of this process. I not sure exactly what I am going to do with the photos, but I found it very interesting.