Turning things on and off

Sometimes the most everyday objects are the ones we don't know the name for. Today we'll look at things for turning (or switching) things on and off.

For the lights in your house, you'll probably have a light switch. (This poster is from World War II, encouraging people to save electricity.)

Your cooker [AmEng] probably has knobs for turning the gas (or electricity) on and off.

I don't know where this button is from, but I like the old brass.