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.
Robots in literature
While Karel Čapek's play introduced the word "robot" into languages around the globe but he later wrote a letter to the Oxford English Dictionary of etymology in which he named his brother, painter and writer Josef Čapek, as its true inventor. In an article in the Czech Lidové noviny in 1933 he also explains that he originally wanted to call the creatures "laboři" from the Latin word "labor". Karel found the word too bookish and sought advice from Josef who suggested to call them "robots". The word, which is always capitalized in Čapek's play, derives from "robota" which means "drudgery" in Czech and means "work" in Slovak.)