Etch A Sketch Turns 50 Years Old

On July 12, 1960, the Etch A Sketch Magic Screen drawing toy, invented by French electrician Andre Cassagnes, was first produced by the Ohio Art Co. and went 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.

Granjean 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.

Read the full Wired article here