The following inventions have been patented this week, as will be found by referring to our List of Claims on another page :— MILLSTONE EYE.—This invention consists in placing a cylinder within the eye of the upper stone or runner, and giving the cylinder a vibratory movement, so that the eye will be prevented from becoming clogged. Win-ser Smith, of Princeton, Iowa, is the inventor. FEEDING DEVICE FOE SAWMILLS.—Hiram Wells, of Florence, Mass., has invented an improved combination of mechanism to feed the stuff to the saws of sawing machines, and to gig back the frame when the stuff is sawn through. CUT-OF FOR STEAM ENGINES.—Addison Crosby, of Fredonia, N. Y., has invented a new cut-off for steam engines. It is an excellent invention, although it is impossible to explain it without accompanying drawings. SAWING MACHINE.—A curved or segment saw is placed in a swinging frame, and so arranged that any of the ordinary horse-powers may be employed, and logs can be sawn with much greater facility and more rapidity than by the ordinary up-and-down or circular saw. It is the invention of John Mays, Yazoo City, Miss. SAWING MACHINE.—This invention consists in attaching the upper and lower ends of the saw to springs, and giving the saw a reciprocating motion by means of a cam, so that the saw is properly strained without a sash, and all "back lash" is prevented. There is also an attachment for blowing away the sawdust off the stuff in front of the saw, so that the tracing or line to be followed can always be seen. It is the invention of U. B. Vida], of Philadelphia, Pa. DOUBLE-SEAMING MACHINE FOE TINNED WARE.—The great quantity of tinned ware in every-day use, and consequent regular demand for it, has stimulated inventors to originate or improve the machinery employed in its manufacture. This machine, the invention of L. E. Porter, of Lake Mills, Wis., has a peculiar arrangement of frames which contain the rollers that perform the work—that is, the closing of the seams and joints ; by this arrangement a double seam or locked joint is closed or formed, thus making a more-perfect joint than by the ordinary machines. MACHINE FOR FORMING THE BRIMS OF HATS.—This invention consists in the employment of two pairs of conical rollers—the upper rollers of both pairs being placed in a vibrating frame, the lower rollers of the pairs are allowed a certain degree of vertical play or motion. The two pairs have different speeds imparted to them, and are arranged with an adjustable bed and rotating plate, on which the hat that is to have a brim rolled out is placed. It is the invention of W. A. Fenn, of Brookfield, Conn. ROPE MACHINES.—William Coutie, of Troy, N. Y., has invented some improvements in that class of rope-making machines known as the " sun and planet" machine, the object of the new arrangement being to prevent the great development of centrifugal force which is at a high speed so injurious to the common " sun and planet" machine, and thereby to enable the machine to be driven with safety at a much greater speed. Another object is to keep the machine always in balance, and to prevent the injurious action which, in the common machine, results from the unequal quantities of strand on the flyers, causing the machine to get out of balance. COVERING NAIL HEADS.—A machine has been invented by J. P. Blake, of Waterbury, Conn., for covering nail heads with thin sheet brass or other metal. It first presses the piece of metal forming the cover on to the head of the nail by means of a die, and afterwards bends the surplus metal under, thus forming a perfect and fast cover. The machine performs all the operations of feeding, &c, automatically. MAGNETIC CAE BRAKE.—Various have been the methods proposed to enable electro-magnetism to be used not only as a motive power, but as a method of arresting motion. For the latter purpose the car brake invented by S. D. Carpenter, of Madison, Wis., is one of the most simple contrivances. He attaches two electro-magnets (one each side) to the shoe bars, and has them connected with a convenient battery ; the moment the current passes around them they grip the wheel tight, and tend to stop the car. SHINGLE PLANER—This machine employs two bevel carriages. These carriages are moved back and forth in opposite directions. The main improvement is in effecting the reciprocating of the two carriages by the simple means of two pinions and two self-adjusting racks, each of which has only one line of teeth, which are on its underside, but detached from the same. A secondary improvement is in having the head-blocks adjustable and self-confining, by the simple means of a set-screw and spring yoke with lip or catch. It is the invention of George Darby and J. E. Young, of Augusta, Me., and is very simple, and not liable to get out of order. RAILWAY INDICATOE.—Lewis Troost, of Mobile, Ala., has invented and patented (in England, June 15, 1857, and France, June 18, 1857) an apparatus for registering every second or other interval of time between the departure of a railway train and its arrival at its destination, by a series of marks produced in one or more lines by a pen, style or other marking instrument on a strip or sheet of paper or any other suitable surface, and the registration upon the same surface of every one or more revolutions of the wheels of the train, or of any wheel attached to one of the cars running on the tracks, by one or more series of marks produced in one or more lines parallel with or conveniently contiguous to the line or lines'of registration of time by means of one or more pens, styles or other marking instrument whose operations are controlled by the said wheel. By the comparison of these registrations of time and distance—tha registration of the revolutions of the wheel being an indication of the distance—the exact rate of the train at any time, can be determined; and the register of time proceeding when the train is stationary indicates the length of the stoppage, the localities of which are also indicated by a comparison with the registration of distance. The invention also consists in causing marks of a different characterto those produced by the revolutions of the wheel in running forward, to be given when the wheel is running backward ; such marks being continued in the same line or lines or nearly so as those registering the forward revolution of the wheel, so as to enable them to be compared with the registration of time to show the time occupied in backing ; the different characters of the marks produced by the forward and backward revolutions of the wheel serving also to indicate the localities of the backing places, and by deducting the distances backed from the whole number of forward ones, the exact distance made by the train can be calculated. This is an invention of great value to railway companies, as it enables the superintendent to keep a perfect record of the performance of each train, and compare with accuracy the various results.