The following inventions have been patented this week, as will be found by referring to our List of Claims on another page :— COUNTERFEIT COIN DETECTORS.—This detector is a combination of a measurer and weigher by which means a coin, on being put in its proper place, can instantly be known, whether it is good or not. It is the invention of F. J. Herpers, of Newark, N. J. TOOL FOR CUTTING LOCOMOTIVE JOURNALS.—This tool is a useful little implement, consisting of semi-circular cutting bits, which are clasped round the journal to be cut, by a brace and ratchet handle, and as they are worked round they gradually form the journal in a neat and expeditious way. It is the invention of J. Hall, of New Haven, Conn. SAW MILL.—This invention provides a guide for the saw at its upper and lower end, fore and aft, in such a manner that the saw has no chance to buckle. The invention also provides a simple means whereby all the feed rollers can be adjusted together laterally, so as to saw different thicknesses of boards, and when adjusted can be retained so without clamping or using any auxiliary hold-fasts. D. B. Bartholomew, of Lancaster, Pa., is the inventor. DEVICE FOR SQUARING LOGS.—This invention consists in the employment or use of a square, properly graduated, each arm being provided with a graduated s1'de, and these parts are so arranged that the log or stick of timber may be at once maked on the four "ides if necessary, without any further adjustment of the squares after fitting them to the log. It is the invention of Jacob Hoke, of Grand Detour, Ill. LIGHTNING CONDUCTOR.—J. B. Elliott, of Philadelphia, Pa., has invented a new conductor of corrugated copper, the object of which is to facilitate the equalization of the ascending and descending current, so that the conductor will act in the most efficient manner, as regards capacity or conducting power; also to so connect the parts of the rod that perfect joints are made, and a direct and unbroken communication is always maintained throughout. The conductor is firmly attached to the building, due allowances being made for loosening by the atmospheric changes, and perfect insulation always maintained. GOVERNOR FOR STEAM ENGINES.—Captain H. N. Throop, of Pultneyville, N. Y., has invented a new governor, which consists in a wheel with a series of connected segments so applied as to be capable of moving from and towards its center, or, in other words, to form an expanding and contracting rim, and combined with a spring or springs acting in opposition to the centrifugal force generated in the expanding rim by the rotation of the wheel. The rim extends from the axis as the velocity increases, and draws nearer as the velocity diminishes; by this meaus, through suitable mechanism, it can be made to act on a regulator, and will work in any position of the axis, thus possessing a great advantage over the common ball governor. The following inventions and improvements were patented last week, but we were unable to publish these notices until the present opportunity :— SUBMERGED ROTARY PUMP—An improvement has been invented by H. Lindsay, of Ashville, N. C., on a submerged pump, an engraving of which appeared on page 310, Vol. XI, SCIENTIFIC AMERICAN. A cylinder with two pistons is placed at the bottom of the well, and a long pipe passes up to the top of the well to conduct the water as fast as forced up by the pistons. The power is applied by revolving the hollow shaft through a crank in the upper end of the the same. As the shaft revolves, the cylinder ana pistons move with it, and in their movement the pistons are alternately forced in and out by means of an eccentric and moving ring, at the center of the well, instead of by means of stationary inclined planes at the circumference of the well. PHOTOGRAPHIC PICTURES—This invention consists in flowing wax or varnish over the front side of a glass tablet which has a portrait on its back side, and rubbing said varnish down so as to give the glass tablet a semi-opake granular appearance, similar to canvass und thus destroying the glaze of the glass and imparting to the picture an atmospheric relief. The wax or varnish coating also provides a surface for the artist to paint dmpery upon, after the portrait is finished. It was invented by E. C. Hawkins, of Cincinnati, Ohio. ATTACHMENT OF PUMP TO OSCILLATING ENGI"E.—The novelty of this invention is the formation of the pump in the side of the engine cylinder and having the piston of the pump operated by the same crank that moves the engine piston. In order to apply this improvement, the trunnions of the engine cylinder are made hollow, and furnished with suitable passages and cut-offs. The inlet and discharge of the water, and the induction and eduction of the steam, is effected through the two trunnions, without the use of any auxiliary valves. It was invented by G. Sprenkel and T. W. Basford, of Harrisonburg, Va. USING EXHAUST STEAM.—This invention consists of a circular rotating valve or wheel with four or more eccentric pistons, and an equal number of oscillating cJlinders. This valve is arranged within the steam chest and has its pistons perfectly balanced by the steam pressing on all sides equally. Thc pistons and cylinders pass through a channel which receives the exhaust steam, and the cylinders being open receive and lift it past an abutment from which it is discharged into the steam chest, where it is used for driving the engine. This invention will answer well as a boiler-feeder, or for feeding any fluid into a chamber against the pressure of steam. It is the invention of Lewis Martin, of New York. SCREW CUTTER.—This invention consists in confining the dies by means of eye-seraw bolts—so that each one may be removed separately, and that the screw thread may bo cut entirely up to the head of the bolt. Another feature of this invention consists in haying the chuck-plate tubular and open at its periphery, so that a eurrent of air may circulate round the screw bolt and thus keep the bolt cool and prevent an unequal expansion of the thread. And a third feature is the formation of oil reservoirs in front of the die-chuck, so that the oil is automatically and regularly supplied to ii the dies or cutters. It is the invention of )t Wm. Kenyon, of Steubenville, Ohio.