Sister sites

• Steam engines — How steam engines work, from Newcomen and Watt to Rocket, with no-heat experiments and games.
• Simple machines — The six simple machines, mechanical advantage, kitchen-table experiments and a lever calculator.
• Clocks and clockwork — How a clock turns a weight or a spring into a steady tick: gear trains, escapements, pendulums and Harrison’s sea clocks.

The hub for all of them is mechanics.im.