Analog robot
An analog robot is a type of robot which uses analog circuitry to go toward a simple goal such as finding more light or responding to sound. The first real analog robot was invented in the 1940s by William Grey Walter. The name of these robots were ELSIE and ELMER (Electro Mechanical Robot). The original circuitry was developed using two vacuum tubes and a photocell to search and follow a light. Recently a kind of analog robots was developed by Mark Tilden.
Robotic art
In the thirteenth century AD, Badi Al-Zaman'Isma'il Al-Razzaz Al-Jazari was a Muslim inventor who devoted himself to mechanical engineering. Like Hero, he experimented with water clocks and other hydraulic mechanisms. Al-Jaziri’s life's work culminated in a book which he called "The Book of Knowledge of Ingenious Mechanical Devices", completed in 1206 AD, and often known simply as "Automata". In Europe, also in the thirteenth century, Villard de Honnecourt is known to have built mechanical angels for the French court, and in the fifteenth century Johannes Muller built both a working mechanical eagle and a fly.