I’ve been curious about this for some time now. You know those weird electrical devices that you sometimes see in cheesy Sci-Fi films from the 50’s? It’s basically some kind of a box with two long metal rods (electrodes?) sticking out in a v-shape like a pair of rabbit-ear antennae on a TV. When you turn it on, an electrical spark arcs between the two rods and rises to the top with that familiar buzzing sound.
What the heck is this device called?