The annexed engravings are views of an improvement in Rotary Stove Grates, invented by Alexander Harrison, of the City of Philadelphia, and patented or. the 5th of last October (1852). Figure 1 is a sectional view of a cylindrical stove, with the improved grating applied thereto ; and fig. 2 is an under-side plan view looking upwards. The same letters refer to like parts. Fig. 1 A is the cylinder of the stove, at the lower part of which is a small ledge, b b, projecting about three or four inches around the interior of the cylinder. At the inner edge of the ledge is fixed a series of small upright metal bars, d d, about two inches high, with spaces between lor the admission of air. At the lower end of these bars is placed a flat circular grate, G, which forms the bottom of the stove, and is supported at its centre by a small vertical spindle or shaft, E. This latter rests in a socket formed in the horizontal cross shaft, F, one end of which rotates in a bearing, H, and the other in the mitre-geared wheel, C. Fig. 2. By an arrangement, as seen in fig. 2, this cog-wheel gears into a set of teeth, h h, round the under-side of the grate, G, so that, by turning the crank, N, motion is given to the shaft, K, and cog-wheel, C, the shaft, K, working in a beariiig at L, and through a small vertical hanger at M ; by which action the ashes are discharged from the grate. On the other side of the stove there is a similar crank, 0 belonging to the shaft, F, by turning which the spindle and grate are made to cant over and thus empty the latter of its contents. A pin is inserted at P to prevent the grate lrom turning over, which is withdrawn when it is required to tilt the grate. The operation of this grate is so plain, that no further description is necessary ; the invention, is a good one. More information may be obtained by letter addressed to Mr. Harrison, at Philadelphia