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.
Eric (robot)
Eric was the first British robot, built in 1928 by First World War veteran Captain William Richards, and aircraft engineer Alan Reffell. He was constructed to open the Exhibition of the Society of Model Engineers at London's Royal Horticultural Hall in 1928, after George VI (then the Duke of York) cancelled and an exasperated Richards, the exhibition's secretary, offered to "make a man of tin" to take the Duke's place. At the event's opening, Eric rose to his feet, bowed and gave a four-minute opening address.