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.
Boilerplate (robot)
Boilerplate is built by Professor Archibald Campion in the 1880s and unveiled at the 1893 World's Columbian Exposition in Chicago. The robot's notable adventures include an expedition to the Antarctic, during which it saves the lives of the team members by singlehandedly moving ice floes, clearing a path for the ship to sail out.