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U.S. Shot Furnace

U.S. SHOT FURNACE 

This structure is a hot shot furnace for heating cannon balls to 
be shot at wooden vessels and to set them on fire. It is part of the 
water battery built by the U.S. (1842-44) when this side of the 
moat was filled and guns were mounted on the stone arcs behind 
the sea wall.

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