The following inventions have been patented this week, as will be found by referring to our List of Claims :— TYMPAN FOE PRINTING PRESSES—L. T. Wells, of Cincinnati, Ohio, has invented an improved method of attaching the cloth or parchment to the tympan frame. He inserts in the frame strips of leather with eyelets, and to these the cloth or parchment is secured by lacing. It can be easily attached or removed, and forms a great convenience to the printing office. TURNING MACHINE.—John McNary, of Brooklyn, N. Y., has invented an improved turning machine for shaping regular or cylindrical ornamental forms, such as newels, ballusters, and similar beaded or ornamental work. The invention consists in a peouliar arrangement of means for operating rotary cutter stocks, and traveling heads, between which the stuff to be turned is centered, whereby the machine is rendered automatic in its action throughout, and made to work rapidly, and in the most efficient manner. SAWING MACHINE.—H. S. Vroemaii, of New York, has invented a machine for sawing timber or logs spirally or in volute form in one continuous piece from the periphery to the center. The invention consists in a peculiar arrangement of meansfor operating a reciprocating knife or saw, and giving the same a proper feed movement towards the log or stuff being sawed, and also in giving the log or stuff which is centered between arbors, a gradually progressive rotating speed, so as to compensate for its gradually diminishing diameter while being sawed, and thereby allow the knife or saw to cut the log or stuff in spiral or volute form from periphery to center, or nearly to the center in a single or continuous piece. The invention is designed for sawing thin stuff, such as is used for the backs of mirrors, boxes, veneers and other purposes. The inventor has assigned his invention to H. Albro, of Covington, Ky. MACHINE FOR BENDING WOOD.—Thomas Blanchard, of Boston, Mass., whose invention of a machine for a similar purpose we noticed on page 240 of the present volume of the SCIENTIFIC AMERICAN, has invented certain improvements relating to a device by which wood is bent in the desired form without having its fibre distended longitudinally, so that the strength of the wood will not be impaired in consequence of being bent. The invention consists in the employment of a rotating pattern or mold with a metallic strap attached, used in connection with a sliding pressure bar, having an adjustable stop fitted to it, the Outer end of the metallic strap being attached to the sliding bar, and the whole arranged so as to form a simple and efficient machine. QUARTZ MACHINE.—W. H. Howland, of Sacramento City, Cal., has invented a machine for this purpose, the object of which is to obtain a very compact a,nd efficient machine, and one that will not easily get out of repair, and having its parts so arranged that each will perform its full portion of the work to be accomplished. The machine is designed for crushing auriferous quartz, and consists of a series of pestles placed within an annular mortar and around a feeding spout, the pestles being operated by a horizontal double inclined cam, which acts against circular disks attached to the pestle rods, so that the pestles will be rotated as they are raised by the cam. There is also in connection with the above parts a screen and pulp trough, for the purpose of better separating the crushed materials. BRICK KILN.—This invention obviates many serious objections which are experienced in the burning of brick in ordinary kilns. The most prominent among these are the rapid destruction of the grates or furnaces, choking up the throats of the furnaces by the collection of charred fuel thereat, difficulty in burning the "heads" or sidewalls of the kiln to the same degree, within a given time, as the body of the same ; also the unequal diffusion of the heat throughout the entire kiln from the side walls to the centre, and a too rapid escape of the heated name or current directly up between the bricks forming the stands and arches ; want of facilities for controlling the flame or heat, so as to equalize the heat at all parts ef the kiln ; loss of heat from the escape into the open air of partially ignited smoke or gases emitted from the fuel of the furnaces. We regard this as a first-rate improvement, and as a step in advance of anything we have seen in this line. The inventor is J. W. Crary, of New Orleans, La. GAS ENGINE.—In using the vapors of gaseous liquids as a motor, it is found that owing to the vapor being so rapidly generated or thrown off by the action of heat, and as readily condensed by contact with surfaces of less temperature than themselves through which they circulate that unless a uniformity of heat is maintained throughout the whole heating and working arrangement, great loss of effective power, as well as an irregular and unsteady working of the engine, will be experienced. The object of this invention is to avoid this loss of power, and to n/aintain a uniform pressure of vapor, and consequently effect a regular and steady working of the engine which is accomplished by diffusing, by means of a heating medium enclosed within a tight chamber, an equal heat over the whole surfaces through which the gaseous vapors necessarily have to circulate in order to exert their force upon the piston. The inventor is J. C. Fr. Salomon, of Baltimore, Md. SAW MILLS.—In saw mills which have the carriage arranged to run upon friction wheels having a lateral movement by means of offset boxes from toward the saw while gigging back, and which have the feeding head blocks, feed automatically by means of an oblique inclined gage bar and ratchet lever, inaccuracies are experienced in the thickness of the boards sawed. This difficulty arising from the wear of the boxes and track, and the consequent chance allowed the carriage of being forced from the saw, when the feeding ratchet lever comes suddenly in contact with the inclined gage bar, and is resisted by said bar in a manner to effect the feeding of the head blocks, and yet, at the same time, to pull over the carriage head blocks and log the same distance as the wear of the boxes and rails willallow. This invention of W. M. Ferry, Jr., of Ferrysburg, Mich., which is clearly defined by the claim, completely obviates the above objections, and therefore will prove a valuable auxiliary to elf-setting saw mills.