Template:POTD/2007-06-18
Two
cylindrical in shape, with two or more contacts. Originally invented for use in telephone switchboards, jack plugs are still widely used, both in the original ¼-inch (6.3 mm) size and in miniaturized versions. The top plug in this image is for stereo connections, while the bottom is for mono.Image credit: Søren Peo Pedersen
 | This picture of the day has been featured on Portal:Technology. |