Screw-lathes were vital to that. Having a lathe capable of making more accurate screws can be used to make more accurate lathes. Then rulers can be made using s

Screw-lathes were vital to that. Having a lathe capable of making more accurate screws can be used to make more accurate lathes. Then rulers can be made using screws. More detail here: https://www.plethora.com/insights/the-evolution-of-precision-tools https://www.plethora.com/insights/the-evolution-of-precision...