How do etch-a-sketch’s work?
In: Technology
The etch-a-sketch is filled with a sticky aluminum powder that coats the screen when you shake it upside down. Inside the machine is a stylus that rides on the screen and is connected to two sliding rods that are moved by cables attached to the control knobs. Turning the knobs slides the stylus acrosss the screen scraping off the aluminum powder and leaving a dark line in the screen.
[This](https://thedayintech.files.wordpress.com/2013/07/etch1.jpg) is the machinery inside under the screen.
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