Simple machines: 4-in-1 hydraulic machines set

This kit lets aspiring engineers and tinkerers of all ages build four simple machines that explore the mechanics of hydraulics. This set allows you to build a Platform Lifter, Scissor Lift, Cherry Picker, and Excavator.

Each working model uses water as the hydraulic fluid, comes with pre-cut wood pieces, and instructions. You supply the white glue and the time to put them together.

Here's the full product listing for the 4-in-1 hydraulic machines set.

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Del's First Wooden Machine, circa 1982

Here is a video demonstrating Del Short's earlier wooden mechanical device, made back in 1982. High-maintenance, but no-less amazing.