The Dynamometer operates by turning air pressure into motion. This model will give direction to your otherwise aimless day. Blow on the top gear to set the mechanism in motion. The air pressure you apply spins the arrow until it lands on your task for the day. Now get to it!
The Dynamometer is one of the simplest UGears models but at the same time it demonstrates several basic principles of mechanics, including the cascade of gears and the mechanical junction known as the Geneva drive.