How do etch-a-sketch’s work?
In: Technology
You can see how an etch-a-sketch works by drawing over the entire screen.
As you draw bigger and bigger black spots, you start to see through. The lines aren’t black ink. The lines scrape off a powder coating on the inside of the glass, exposing the inside. When hardly any of the screen is clear, the inside is dark, so you see a dark line. But as you start to clear off bigger areas, you see inside. What’s there is a sort of stylus, pressing against the screen, and a vertical and horizontal bar which move the stylus around when you turn the knobs. The stylus scrapes the grey powder off off the glass. There are also a bazillion tiny balls. When you turn the etch-a-sketch upside-down to “erase” it, those balls spread the grey powder all over the glass, covering up the parts you cleared off.
Try it! It’s cool.
Latest Answers