The invention of the bayonet socket.

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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[1]. 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[2] 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.

  1. bayonet-socket
  2. OfIngeniousMechanicalDevices/mode/2up, pages 252-253.