Carl W. Mitman explains the screw in this article, the seventh of a series on mechanical powers.
Forces: The Screw (Part 7) (original article)
Simple Levers -Part 1 (original article)
Moments And Compound Levers (Part 2) (original article)
Friction: Wheel And Axle (Part 3) (original article)
Gravity: Revolving Levers (Part 4) (original article)
Part 5 is missing
Inclined Plane And Wedge (Part 6) (original article)





