Schematic and block diagram for an analog control system. It controls position of a ship's rudder, and illustrates basic control system concepts, like a closed control loop with feedback.
<a href="//commons.wikimedia.org/wiki/User:Miroslav_Cika" title="User:Miroslav Cika">Miroslav Cika</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>