Archimedes screw – double thread revisited
Steve Seidl from frankenpaper.com sent me these pictures of a double
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Archimedes screw – double thread
My first draft at an Archimedes screw in the previous post
A Brief Diversion – The Archimedes Screw
This morning I had an Google chat message (I'm usually
Blog : Shop – Rationalisation.
When I originally set up robives.com I had some downloadable
