[Sender]

The USS Constitution was sheathed with copper on the bottom.

[Rudder]

USS Constitution showing portion of copper-sheath hull

[Calvin Locke]

The first attack by a "submarine" (the Turtle) was foiled by copper sheathing.

The idea was to attach a mine via a line that attached to the hull via a "screw".

The screw was cast iron, and it just couldn't penetrate the copper.

[Barnacle]

The USS Constitution was sheathed with copper on the bottom.

That was to kill barnacles... Not that I take that personal.