Screw for Lifting Weights, with Pulleys and Pile Driver
A screw jack that lifts the same wherever the rope is held
A screw jack for raising weights stands in a splayed frame at the top of the sheet, its point of attachment marked r. Leonardo notes that a rope fastened at r lets the operator stand wherever he likes and still act as though he were at r. Below are pulleys and a pile driver for driving stakes into the ground.
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Screw jack for lifting weights
A rope is attached at r; wherever the operator stands, the effect is always as if he stood at r.
Pulleys and pile driver
Below the screw are pulleys and a pile driver used to drive stakes into the ground.