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.
Robotics
The word "robotics" was derived from the word "robot", which was introduced to the public by Czech writer Karel Čapek in his play "R.U.R. (Rossum's Universal Robots)", which was published in 1920. The word "robot" comes from the Slavic word "robota", which means labour/work. The play begins in a factory that makes artificial people called "robots", creatures who can be mistaken for humans – very similar to the modern ideas of androids. Karel Čapek himself did not coin the word. He wrote a short letter in reference to an etymology in the "Oxford English Dictionary" in which he named his brother Josef Čapek as its actual originator.