The Chilian gun now being built at Pittsburgh, is 22¼ feet in length, being two feet longer than the famous Rodman gun at Fort Hamilton, this harbor, but of exactly the same bore, twenty inches. Its greatest diameter is 5 feet 4 inches, its least diameter, 2 feet 9 inches. The gun is designed for garrison or naval service. * * * * * From lack of economy, in reduction of ores, it is estimated that the aggregate loss on the production of bullion in this country for the present year will reach the sum of $25,000,000. * * * * * Recent American and foreign Patents. _Under this heading we shall publish weekly notes of some of the more prominent home and foreign patents._ * * * * * WARDROBE.--Nathan Turner, West Lynn, Mass.--This invention consists in a movable or swinging arrangement of the sides and top and bottom, whereby they are folded upon each other, with grooves or strips in or upon the sides to support shelves when used as a closet or book case, and which shelves may be removed when used as a wardrobe. AXLE BOX.--Henry B. Pitner, La Porte, Ind.--This invention consists of an iron thimble or slieve provided on each end in the inside with a screw thread into which are fitted ends of brass or composition, or other metal softer than iron, in such a way that said metallic ends will not turn in the box, and so that the axle bears only upon the softer metal. SPRING FORMER.--George S. Long, Bridgeport, Conn.--This invention consists of a vibrating anvil or former, upon which the steel to be worked is placed, said former vibrating under a roller, said roller being hollow, and provided with holes or orifices through which water received in the shaft of said roller is distributed upon the heated steel. DOOR-FASTENER.--Francis C. Levalley, Warrenville, N. Y.--The present invention relates to a fastener for doors more particularly which, in the construction and arrangement of its parts, is simple, and most effective, and secure, when fastened. ROOFING.--Orville Manly, Garrettsville, Ohio.--This invention consists of tiles saturated with raw coal tar, made in the same way as ordinary brick, having all the edges bevelled, being thicker at one end, and laid upon the roof with the thicker end towards the eaves, and the spaces between the tiles formed by the bevelled sides of the same filled with a cement made of raw coal and clay. FOLDING BEDSTEAD OR CRIB.--R. S. Titcomb, Gloversville, N. Y.--This invention consists of the parts being attached to each other by pivots and hinges, whereby the same may be folded in upon the bed and clothing, and upon each other.