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Screws - The Early Years. By Machine Thinking. 18:32 video:
https://www.youtube.com/watch?v=yzMU8rH4PN8
Previously:
https://www.homemadetools.net/forum/...846#post119331
https://www.homemadetools.net/forum/...278#post130935
https://www.homemadetools.net/forum/...042#post120331
At 18:17 "What do you think about screws?"
I'll tell you what: I'm pretty sure Hero's original screw threading machine worked in unified Imperial threads, like God intended!
It's a hardball world. We've got to try to keep our heads until this metric craze blows over!