Etch A Sketch
Etch A Sketch ™ is a variant of the magic board, which is not deductible pin is controlled by two knobs each moved horizontally and vertically. The particular style of painting and the underlying principle of operation made the the time sold as a toy instrument particularly popular in the 1970s.
In Austria, this toy was extremely popular already in the 1960s. The frame of the classical device is red with a gold embossed lettering " Magic Etch A Sketch Screen", white knobs and black backing. The canvas is gray and it can only black lines are drawn. The rather angular therefore come strokes contribute to the special charm because the characters method represents a challenge to the skill of the artist.
Operation
The canvas consists of a sheet of glass that is coated on the back with a sticky, shiny silver powder (aluminum and styrene ). The spring andrückende pen scrapes with each movement from the powder and so leaves a line that provides a view into the housing interior, but appears dark because of the low incidence of light. Each of the two knobs moves the pen in a mutually perpendicular dimension - for diagonal lines both buttons must therefore be moved at a constant speed of rotation. The glass pane closes the flat plastic housing of the Etch A Sketch with the powder therein and the mechanism for the pin; by inverting and shaking the powder is distributed back to the drawing area and the old image is deleted.
The pin guide the Etch A Sketch corresponds with their X and Y control of a plotter and requires the signatories to a significant degree of motor coordination. Since you can not lift the stylus, the subject must also be drawn in a train.
History
The first prototype was developed in 1957 by André Cassagnes and 1959 presented at the Nuremberg Toy Fair. Etch A Sketch ™ is distributed by the Ohio Art Company. The company has acquired in 1960, the license rights to the invention and sold the first copies that year just before Christmas.
In addition to the classical case, the color red Etch A Sketch was later also available in other colors. In the 1980s, a computer game that simulated an Etch A Sketch was made.