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Where DO screws come from?

Please support me on Patreon   / machinethinking   The first in a series of four videos on screws, though other videos might get mixed in. 0:00 Introduction 0:54 Waterscrews 1:48 Fruit presses 4:08 Worm Drive 5:24 Internal thread cutting 7:19 Dioptra 7:50 Armor screws 8:17 Screws vs bolts 9:01 Armor part II 9:26 Early screw drivers 9:47 Medieval House book 13:01 Löffelholz Kodex 15:22 Ediphone 17:31 Conclusion More info: http://machinethinking.co/ Contact me: http://machinethinking.co/contact/ More Medieval House book images: https://commons.wikimedia.org/wiki/Ca... Löffelholz Kodex PDF. (Also sometimes spelled Löffelholtz) https://machinethinking.co/2020/11/17... Plastic Injection molding animation from EngineerGuy:    • Plastic Injection Molding   "Mary had a little lamb" recording is Edison himself, but recorded about 30 years later, recreating what were supposedly the first recorded words by him. The machine shown is his second prototype, though the first was fairly similar. I'm well aware many consider Edison a jerk (to be polite) and he indeed did some pretty unsavory things. However, his immense contributions to many industries, including recorded media (audio and visual) are worthy of note. Don't worry, I'll cover some of his shortcomings in future videos.