Trek.pub Trekking around the net
This is a wooden marble machine. It is 6 feet tall, and is powered only by potential energy, a little kinetic energy and gravity. there …
The post Marble Machine 3 appeared first on Gravitrax.trek.pub.
Follow the rest of this piece over at: Gravitrax.trek.pub (Read More). Gravitrax is a very fun marble run board game, the website is dedicated to that.
