A Strange Manuscript Found in a Copper Cylinder

The article in question was made of metal and was cylindrical in shape. It was soldered tight and evidently contained something. It was about eighteen inches long and eight wide. The nature of the metal was not easily perceptible, for it was coated with slime, and covered over about half its surface with barnacles and sea-weed. It was not heavy, and would have floated higher out of the water had it not been for these encumbrances.