Figure 1 is an outside longitudinal view of the furnace, with the plates of the hot-air passages removed, and fig. 2 is a vertical longitudinal section, showing the interior. The patentee of this invention is Christopher G.Best of the City of Albany, N. Y.; the patent was granted on the first of last August, but the engravings represent an improvement made since the patent was issued for heating the air for combustion before it enters the furnace, by making it pass around the chimney. The same letters on both figures refer to like parts. The nature of the patented improvement consists in having a separate chamber from that of the fire, in which the metal to be smelted is placed, the fire being near to the metal, and the heat of the fire being made to act upon and pass down through the whole of the metal in the iurr-a:e. thus enabling the heat or products of combustion to act more evenly and to be more thoroughly diffused throughout the whole stack of metal than in furnaces which are in omrnon use. In fig. 2, the metal to be smelted is Suilt up in the stack irwrely to show the operation of the fire ami neat passing down borough it, as indicated by the arrow. The molten metal flows away down the inclined plate at the back of the furnace, and the heated gase3 pass away, up the chimney, D. New iron is fed in through the man-hole, C, and the fire doors are placed at the end of the furnace: there is a large deep ash-pit below the fire-bars. There is a complete circulation of the til in the lurnace; the air to support combustion is represented by the arrows, moving from light to left, then into the fire where it unites with the carbon of the fuel forming carbonic acid, and then passes out, as has been stated, from left to right. The cold air to feed the fire is fed in by a blowerthrough ths perforations, A A, in plates aroind the chimney, D, then it passes up and Uwn on the opposite side of the chimney, as ftown by the arrows (the plate at the one side, lo guide the air, is not shown, but will easily be understood , then passes over the outsideof the metal stack uy the passage wav, B, in for and up through the ** p' into the fire a the air is thus highly heated before it enters the fije and by such heat as would otherwise ie wasted, by which operation a grea* quantity of luel is saved. The construction of this reverberatory furnace allows it, like a enp'a, to be charged nt intervals It will answer for anthracite or bitnmirouscnal- and CP.II be: used either as a drait furnace, simply, of as a blastfurnace. The pigs to be melted are placed three or four inches apart. Reverberatory furnaces maltf ''Opener iron, bnt they are expensive , — this furnace is designed for cheapness as iveii as superior notion. After the first charge, the remaining iron is thrown in promiscnously. The plates which form the air chamber around the chimney, have prods cast on them, and one side of the plate is covered with fireclay to prevent it from melting. The furnace is built with'the materials best known ar.d in I rotntnon use, to resist the destructive action or [the heat, as the products of combustion in I the state or flams or gas, are alone applied to ! reduce the metal in the chamber the tmelter j has complete control over the metal to reduce lit in the manner which he considers most ap-IpropriFit* this furnace may be built of a: ! square form, but the circular form is the best, for Best's improved furnace, as; here represented. More informition respecting this excellent furnace may be obtained by letter addressed to the patentee.