(Fireball launchers times five on the front of your fighters without the need for ridiculously involved circuitry all actiavted from your comfy lounge chair, I mean pilot's seat. Also keeps the cokpit closer to the nose while increasing space for the powerplant.)

It's nice to know this has been in service for so long, though I've never seen it myself until this accidental discovery the other day.
 For my purposes it's an actuator as it allows me to create automatic valves and other contraptions requiring an actuator. And really, it's more mechanical than electrical in it's design, if you get my meaning, since there's a distinct lack of repeaters or comparators forming the circuit. It's activated by its own deactivation.