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Etch A Sketch

Mechanical drawing toy

  • 7 min read
  • 4 chapters

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Through Pulley, Clockwise and Plotter

An Etch A Sketch has a thick, flat gray screen in a red plastic frame. There are two white knobs on the front of the frame in the lower corners. Twisting the knobs moves a stylus that displaces aluminium powder on the back of the screen, leaving a solid line. The knobs create lineographic images. The left control moves the stylus horizontally, and the right one moves it vertically.

The Etch A Sketch was introduced near the peak of the Baby Boom on July 12, 1960, for $2.99 (equivalent to $33 in 2025). It went on to sell 600,000 units that year and is one of the best known toys of that era. In 1998, it was inducted into the National Toy Hall of Fame at The Strong, in Rochester, New York. In 2003, the Toy Industry Association named Etch A Sketch one of the 100 most memorable toys of the 20th century. The Etch A Sketch has since sold over 100 million units worldwide.

Mechanism

The numbered components correspond to those that move the stylus horizontally, and the lettered components to those that move it vertically.

The device has ten pulleys, six cables, two rails, and a stylus.

Pulley 1 (single-groove) connects to pulley 2 (triple-groove) via a short infinite reciprocating cable. Pulley 2 connects to 3 (double-groove) via a longer reciprocating cable attached along its upper course to one end of the vertical rail (6), and then a third cable runs from 2 to 3, 4, and 5 (4 and 5 are single-groove) via another much longer loop of cable between 4 and 5 to the other end of the vertical rail.

Likewise, A connects to B, B connects to C and attaches to the horizontal rail (F), and finally B connects to C, D, and E, attaching to F at its other end between D and E.

Turning pulley 1 counterclockwise makes 2 rotate the same way, and this makes all pulleys connected to 2 (3, 4, and 5) do the same. The rail these cables connect to (6, connection points marked in red) moves to the left with the cables attached at each end, making the stylus move in the same direction along the other rail (F). Clockwise movement of pulley 1 has the opposite effect.

Pulleys A–E operate the same as 1–5, and act on the horizontal rail (F) to slide the stylus up and down along the vertical one (6).

The pulley system connects the knobs to the two orthogonal rails on which the stylus is mounted, allowing the stylus to move horizontally and vertically across the screen.

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