...p; Baker of Roxbury turned their extensive sewing-machine workshop into a rifle-manufactory, which employed several hundred hands, and this was only one of a large number in that section. Alger, of South Boston , poured the immense molten masses of his cupolas into the moulds of cannon, and his massive steam-hammers pounded out and welded the ponderous shafts of gunboats and monitors. The descendants of Pa...