otical Invp.ntio*i.— useful invention now in the act of beinf? applied to one of our men-of-war. It i» called ■i
... mancßuvrer it is the proposition of K. Poulerton, U Archimedean screw, fitted through the of the ship, at angles with the keel, and set mo t»on the capstan, for the purpose of tumiii)' the ship round, when, from calm weather, the helm has no effect the vessel. It does not project, in any decree, so impede the ship’s way through the water, and must be. highly useful, the ease of a ship being ...