Euler’s Disk is a classic physics toy invented by Joseph Bendik that puts on a hypnotic display as you give it a spin. It starts spinning faster and louder the longer it goes. Toysmith Euler’s Disk comes with multiple holographic films to let you further experiment with this toy.
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Euler's Disk Physics Toy ▶ Gadgetify
You also get a mirror to spin your Euler’s Disk on. The 3″ diameter chrome-plated steel disk’s humming gets louder as the speed increases. The above video shows how it all works.
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