The Next Stage of Touch Screen...

  Allograph is a coordinate counting method developed by Dr. Samuel C. Hurst It was an input tablet. This used to measure where the user was applying pressure with the stylus.

 Hearst started the Allographics company and started selling this device through it. Today the company is known as Elo Touchsystem.

After three years of hard work, Hirst and colleagues created a transparent version of the allograph that could be mounted on a computer screen. Four years later, in 1977, he developed the technology used today for touchscreens.

Fire-wire resistive touchscreens have transparent layers. When a finger touches the screen, these layers are squeezed together and the desired information appears on the screen.