The bayonet socket is a cylindrical socket having one or more L-shaped slots, the longer side parallel and the shorter side perpendicular to the axis of the socket, along which a knoblike projection on the object slides in such a way that a twist of the object when fully inserted locks it into place. It is used in light bulb sockets and in other electrical connectors as well as in lens mounts for cameras.
The Turkish polymath Badi az-Zaman Abu al-Izz ibn Ismail ar-Razzaz al-Jazari (1136-1206) invented the bayonet socket around 1205. He used it on a candle clock which he constructed around the same time. Here is an animation that depicts the working of Al-Jazari’s bayonet socket:
No portrait of Al-Jazari could be found.