What does the popcorn machine use? Electricity and gas. Anything else?

The earliest popcorn machine put rice in a sealed container, then added saccharin, heated it on a fire, and kept rotating the container to make each side of the container heated evenly. After about five minutes, a long bag was aimed at an opening of the container, and the opening of the container was tilted here with a lever. Hearing the same sound, all the rice flowers were scattered into the bag.