At Portsmouth, N. H., was bunched the largest submarine owned by the U. S. She was christened "V1" and is the first of a new series of nine submarines capable of fleet work−that is, capable of maintaining the speed sufficient to cruise with the battle fleet, and having an equal radius of action.

The V-1 is 341 ft. 6 in. over all, 27 ft. 6⅝ in. in breadth, and has a surface displacement of 2,164 tons. Her speed on the surface is to be 21 knots, and submerged, 9 knots. Her complement will consist of...

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