How to calculate the splicing angle of drum

Use trigonometric function to calculate. The sine angle obtained by dividing half of the difference between the major diameter and the minor diameter by the height is the unilateral inclination of the barrel; The formula is "one foot by half an inch", which means that if you want to make a rice cooker with a circumference of three feet, you should incline it by four feet and five inches, and the internal inclination of each board should be consistent, so that there will be no internal cracks and external cracks. At the same time, the outer wall of retort should have two relatively convex retort "ears", which is beneficial to lifting the pot.