Sewing machines are mechanical marvels – here’s how they work. Get your first month of KiwiCo FREE at https://www.kiwico.com/veritasium▀▀▀A huge thanks to Pr...
  • maryjayjay@lemmy.world
    3·
    1 年前

    It’s all about the bobbin. Because the thread in the needle can pass under the bobbin, the machine can make the two threads cross each other