![Harpoon gun](https://cdn.statically.io/img/static.wikia.nocookie.net/memoryalpha/images/0/0b/Harpoon_gun.png/revision/latest/scale-to-width-down/180?cb=20210515190330&path-prefix=en)
Gunners operating the harpoon gun
A harpoon gun was a tool used in the whaling industry. The gun was a cannon mounted onto the bow of a whaling ship. The barrel of the cannon could swivel to either side of the ship. Two individuals were usually assigned to this gun. The loader would manually feed a harpoon into the gun, while a gunner would eyeball the target and fire the harpoon into the whale.
A whaling ship that encountered humpback whales George and Gracie in 1986 was equipped with such a gun. (Star Trek IV: The Voyage Home)