How to manage the barometer of the old popcorn pot

The barometer of the old popcorn pot is 0.62-0.65. China old popcorn machine is an ancient popcorn machine. The old popcorn machine consists of a head screw, a big bent head, a small elbow, a cover, a pressurizing pipe/rod, a cotter pin and a crank. In order to stand on the fire, two supports are needed. Old-fashioned popcorn processing raw materials have wide adaptability, and common grains such as corn, rice, soybeans, broad beans and yellow rice can be processed.