The following inventions have been patented this week, as will be found by referring to our List of Claims : Locomotive Grate.Joseph W. l'ole, of Philadelphia, Pa., has invented an improvement in the grates of locomotives, which consists in a certain construction of hollow grate bars, with provision for the admission of air to be forced through them by the movement of the locomotive for the purpose of keeping them cool. Gas RetoRt CoveR.With this arrangement the retort can be packed by the water in the chamber or channel round its upper edge, sufficiently tight to prevent the escape of the gas when the pressure on the same is at the proper and safe degree, but when the pressure of the gas in the retort becomes too great and dangerous, instead of an explosion occurring the gas wiIl, by means of the perforations in the periphery of the box or cylindrical cover, exert its pressure upon the water in the channel or chamber at the upper edge of the retort and displace and spiIl said water over the upper edge of the chamber or channel until its level falls below the safety perforations in the periphery of the cover, when the gas will have a free escape and cease to act with a dangerous pressnre upon the retort. We regard this as an excellent attachment to gas retorts for family cooking ranges and portable gas apparatus, it rendering explosions impossible. It is the invention of A. Hendrickx, of New York. Switch LalIpThis is a signal lamp for placing upon the switches of a railroad junction. The invention consists in placing within a lantern of proper construction, glass slides of different colors, the slides being fitted in proper guides and connected with a pendulous framethe whole being arranged so that by operating the switch lever the colored slides wiIl be moved or adjusted by the pendulous frame, and a light of a different color thrown from the lantem at every position of the lever, thu indicating the position of the switch. By this invention the signal lantern is rendered self-adjusting or made to operate automatically by the movement of the switch lever, and accidents which have hitherto occurred by the negligence of the switc'hman in not moving the switches will be avoided, for the engineer will be able to see at once the position of a switch. S. N. Lennon, of Deposit, N. Y., is the inventor. Papebmakino Machine.Thomas Lindsay, of WestviIle, and Wm. Geddes, of Seymour, Coun., have invented some improvements in the Fourdrinier papermaking machine, the objects of which is to vary the width of the paper while the machine is in operation and during the process of manufacture. The invention consists in having the "lip" or basin which conducts the pulp from the endless wire apron constructed in two parts, so arranged that one part may slide over the other, and having said parts connected with the " deckles," which, as well as the " deckle straps" are, by a novel mechanism, rendered susceptible of lateral adjustment. The " deckles" determine the width of the pulp on the wire gage apron, and consequently determine the width of the paper, and as the two parts of the " lip'; or basin wllich conducts the pulp to the apron, are conuected to the "deckles" one to each, the two parts of the " lip" or basin wiII be removed simultaneously with the "deckles," and consequently expanded or contracted in width so as to correspond with the width or space between the "deckles." A novel way of adjusting the usual gage for distributing the pulp on the endless wire apron is also employed. These improvements have been patented in England. Gas HegulatorThere are many gas regulators, the opening of whose valve is controlled by the pressure of the gas on an inverted cup floating in a basin of quicksilver, and this invention relates to that description. It consists in the employment, in regulators of that arrangement of a regulating valve of the form of an inverted cup, having apertures in its sides, and dipping into the quicksilver which constitutes the valve seat, this valve being applied to the outlet passage of the regulator, and so connected with the inverted cup by a lever, and the arrangement of the inlet and outlet passages being such that as the street pressure or number of burners in use varies, the valve is caused to dip more or less deeply into the quicksilver, and more or less submerge its apertures, and thus regulate the amount of opening of the valve to supply the gas at all times at an uniform pressure to the burners. The inventor is J. H. Powen, of Newark,. N.J. Milk Closet.E. H. Nash, of Westport, Conn., has invented a new and useful milk closet or house, the object of which is to provide a cheap and portable device, one in which a large number of milk pans can be placed in as small a apace as possible, and in a very expeditious manner, the device being so arranged as to allow the air to circulate freely through it, and at the same time obstruct the sun. The invention is designed for those who have but a very small dairy, too small to warrant the building of an expensive milkhouse, and also for those who at times have a supply of milk greater than can be kept in the permanent milkhouse. The inventor has assigned three-quarters of his invention to Wm. Wood, of the same place. Improvement in Bridges.This invention consists, firstly, in a certain mode of arranging and combining the string pieces or chords, the main and counter braces, tension-rods and counter tension-rods, and bearing blocks, whereby the inventorMr. Albert D. Briggs, of Springfield, Mass.produces a truss frame capable of sustaining any reqnired load with less material than is required with the common mode of arranging and combining the parts. It consists, secondly, in a certain method of increasing the bearing surface for the bearing blocks, against which the , braces abut in truis frames.