Thursday, July 5, 2007

How an Etch-A-Sketch works

Etch2The fine folks at HowStuffWorks took one apart and show us what they found.

When you turn the Etch-a-Sketch upside down and shake, it coats the inside face of the glass with an aluminum powder.

When you turn a knob, it moves its bar, and this moves the stylus. The stylus scratches off the aluminum dust coating the glass to create a line on the screen.


Read the whole article (with pictures)

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