Similar to our Pneumatic Engine, this model operates by turning air pressure into motion. The difference is that 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. The Geneva Drive is a popular device in the world of mechanics, and was originally used to manufacture clocks. One of its slots would be blanked off, so the winder could be turned a certain number times – it prevented springs from being wound too tight.

It works using the same principle of a pneumatic engine where you blow into a special socket or create heat via an ordinary air balloon and the heat powers the device. The Dynamometer model is self-propelled and requires no electricity during operation, which also ups the safety factor when children are using it.
The Geneva Drive incorporates a playful element in its design – simply blow on the top gear and watch the entire system come set in motion via the air pressure.
The arrow points to a funny picture that symbolizes a task or chore that you can complete according to your strength or force applied. It works as per the concept of intermittent motion that is used frequently in film projectors to move the film on one frame at a time, then hold it stationary as the bright projector light is shined through it.
The quirky images can transform this item into a décor element in your house or at the office to add some color to your workplace.

Ugears "Dynamometer Kit" I DIY Self-Assembly Mechanical Kits For Teens and Adults