Machine
Although it looks like a small cannon, I have doubts about whether this machine is a cannon at all. Because it looks a bit like a cannon, the rest looks like a small ship's furnace. Or else it is an important part of the ship. Because this photograph was taken from the Maritime Museum in Chittagong.
Where many more warships are arranged in this way. Those of us who are overwhelmed by the sight of large warships on the television screen but have never had a chance to see the small parts of these ships live can go to this museum to calm our dissatisfied minds.
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This is probably a launcher for depth charges, a anti submarine weapon. Or for fog grenades, that create a fog screen over the water. But some kind of launcher anyway.