Hydraulic recoil mechanism
A hydraulic recoil mechanism is a way of limiting the effects of recoil and adding to the accuracy and firepower of an artillery piece. == Description == The idea of using a water brake to counteract the recoil of naval cannons was first suggested to the British Admiralty by Carl Wilhelm Siemens in the early 1870s, but it took about a decade for the idea to be commercialized, primarily by Josiah Vavasseur.
Source: Wikipedia — Hydraulic recoil mechanism (CC BY-SA 4.0)