A very ingenious discovery, infinitely more curious than the Dutch sawing-mill, has, however, been recently made in London, by Sir George Wright, Bart. of machinery for sawing stone, for which a patent has been obtained, now the property of Samuel Hill, Esq. who has added many improvements to it. By means of a steam-engine, a number of saws are set in motion, by which a solid block of marble or stone, rough from the quarry, can be cut into shafts of columns of diminishing diameters, one within the other, at the same time: the blocks fixed in an iron circular frame, resting upon four small wheels, by which they can be turned round by the person who has the care of a certain number of them, to keep the saws, which are almost in a horizontal position, constantly acting upon them; the blocks are a little inclined, to enable the saws to be supplied with water from a trough above, conducted by means of tin pipes to the respective orifices. By means of this admirable invention, a saving of three-fourths of the stone is produced upon a block of large diameter; the outer cases being as strong as the cube, _five_ men can perform the work which occupied _forty_ before the discovery; and stone columns are reduced to the price of wooden ones. These saws can also cut out an entire gothic window, which they effect at a saving of eighty per cent. with great beauty and precision, and which in its former construction was divided into six different parts; the last savings or cubes, upon being cemented together, constitute a complete gothic column, and the concavity of the divided outer case of a large column forms an entire recess; a block will also, after it has afforded several shafts of columns, form a handsome series of chimnies. The pipes for conveying water by this machinery are much preferred, on account of their durability: the proprietors of several public works have adopted them in preference to those of wood, which are continually wanting repairs. This highly ingenious discovery has been matured and prosecuted with great public spirit and expense by the proprietor, and promises, from its great utility and economy, to become an object of high national importance.