1960: The Etch a Sketch goes on sale.

The technology behind this children’s toy is both simple and complex. Simple, in that an internal stylus is used, manipulated by turning horizontal and vertical knobs to “etch a sketch” onto a glass window coated with aluminum powder.

Complex, because the Etch a Sketch employs a fairly sophisticated pulley system that operates the orthogonal rails that move the stylus around when the knobs are turned. The stylus etches a black line into the powder-coated window to create the drawing.

Along with the aluminum powder, the guts of the toy include a lot of tiny styrene beads that help the powder flow evenly when the sketch is being erased (by shaking), recoating the screen for the next drawing. As for how the aluminum powder sticks to the window, well, it pretty much sticks to everything.

Arthur Granjean, a Frenchman, was the Etch a Sketch’s inventor (he called it L’Ecran Magique, or “The Magic Screen”). After failing to get some of the bigger toy companies to bite, he sold his invention to the Ohio Art Company, which has manufactured it ever since.

Although the traditional Etch a Sketch comes in a red plastic housing, it is now available in several colors.

Source: Howstuffworks.com

Image: Cal Ripken Jr. (George Vlosich III)

This article first appeared on Wired.com July 12, 2007.

See Also:

• Maker Faire: Still Life on Etch-a-Sketch
• Great Geeky Craft: Embroidered Etch-a-Sketch
• Automatic Etch-a-Sketch Clock
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