Note pencils are cylindrical, straight prismatic, elliptical cylindrical and so on. Their cross sections are round, regular polygon, oval and so on. At one time, the use of pencils was far more common than now. The original pencils are all cylindrical and often roll around on the desktop, so they often fall under the desktop and break the nib. So someone applied for a patent to make a pencil into a prism shape, because the output of pencils was very large at that time, but this small patent brought a lot of patent royalties to the inventor and made a lot of money.
In fact, the small woodworking pencil also contains many industrial design considerations.
Because of the different uses and users, pencils include many kinds. Woodworking pencils are mainly used for marking lines, and they will not be put down easily after use (wasting time). Therefore, in order to prevent them from rolling around, they are generally not made into cylindrical or prismatic shapes-because they are thrown away after use, and if they are prismatic, they will still roll and jump. Therefore, every pencil used for carpentry is made into a flat, thick and solid oval cylinder-after being put down, it will not roll or jump continuously due to limited movement, but will roll once or twice or shake a few times to calm itself down. Moreover, woodworking pencils are mostly bright red, so that when you use them again next time, you can easily find them at a glance, instead of looking for them in a pile of tools and articles.