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.
Maschinenmensch
The Maschinenmensch (German for "robot" or literally "machine-person") is a fictional character in Fritz Lang's film "Metropolis", played by German actress Brigitte Helm in both its robot form and human incarnation. She is a gynoid (female robot or android) created by the scientist Rotwang. Named Maria in the film, and "Futura" in Thea von Harbou's original novel "Metropolis", she was one of the first robots ever depicted in cinema.