in the smoke-box was three times as great as in the fire-box; or onethird only of the pressure of the blast was effectively acting in the fire-box.

Mr. McConnell thought it was an important subject for investigation, to ascertain the actual power lost by the resistance of blast-pipes of dif ferent sizes, and under the different circumstances of size and number of tubes. In his own practice he found that small tubes and many of them produced the best effect; the limit in reducing the size of the tubes was their stopping up with pieces of coke whilst working.

The Chairman said he thought there was some advantage in the form of boiler proposed by Mr. Ramsbottom, and that amongst the various modifications that had been proposed of the locomotive boiler, there was not one that was likely to be so useful.

AMERICAN PATENTS.

List of American Patents which issued from November 12 to December 10, (inclusive,) 1850, with Exemplifications by CHARLES M. KELLER, late Chief Examiner of Patents in the U. S. Patent Office.

17. For an Improved Filter for Oils; Thomas Antisell, City of New York, November 12. "The nature of my invention consists in the employment of a filter made as hereinafter described, by the forcible compression of which downwards through the liquid to be filtered and purified, the thinner liquid is separated from the more solid parts, and is made to pass upwards through the filter, above which it may be drawn off by suitable arrangements."

Claim. "I do not lay claim to the congealing of oils by cold, nor to the use of a screw to exert pressure; but what I do claim as my invention, is the use of a filter formed as described, carried downwards by pressure, under the force of which the oleic acid is filtered upwards, and which, applied in connexion with the arrangement described for applying cold, allows oils and fats to be purified in warm weather."

18. For a Machine for making Jack Chains; Charles Atwood and George Kellogg, Birmingham, New Haven County, Connecticut, November 12.

Claim. "What we claim as our invention, is the combination of the parts, movements, and operations in one machine, which are required to make jack chains by one process from the straight wire, after it is cut off in suitable lengths, to finished chain, substantially as described.

"We also claim particularly the stud-pin with a recess in it, substantially as herein described; that is, the use of it as a mandrel, around which the bow of a link is bent, while the bow of another link is held in the recess, thereby forming a continuous chain, and irrespective of the mechanical devices by which it is moved or used.

"We also further claim the partly revolving mandril, with its stud and nipper, and other appendages for bending the last bow of each link, substantially as combined and used in our machine and constituting part of it."

19. For an Improvement in Repeaters for Electro-Magnetic Telegraphs; Charles S. Bulkley, Macon, Bibb county, Georgia, November 12.

Claim. "What I claim as my invention, is the manner of connecting two galvanic circuits with the two electro-magnets (a a and d d) in the said repeater, substantially as herein represented and described, to wit: each of the said galvanic circuits, as it passes through my said Telegraphic Repeater, embracing in its course the armature of the opposite electro-magnet-in the said instrument-previous to its passing through the helices in the electro-magnet embraced in its own respective circuit.

"In combination with the above, I also claim the connecting the points, with the galvanic battery, (or batteries,) when the said points are placed in such positions in relation to the armatures, of the electro-magnets in my said Telegraphic Repeater, that when either one of the said electro-magnets is charged, it will, by attracting its armature against one of the points b, or j, close the poles of the galvanic circuit in which the opposite electro-magnet (in the instrument) is in connexion, and thereby throw the battery into the said circuit, substantially as herein set forth."

20. For an Improvement in Seed Planters; Samuel Cannon, New Richmond, Crawford county, Pennsylvania, November 12.

Claim. "What I claim as my invention, is the attachment of my vertical cylinders to the rear of my ploughs or cultivator (without regard to any particular plough) in combination with its machinery, arranged substantially in the manner and for the purposes herein set forth."

21. For an Improvement in Printing Machines, Oliver T. Eddy, Baltimore, Maryland, November 12.

"Claim. "What I claim as new is-1st, I claim the type form, constructed substantially as described and represented, viz: with the types arranged in rows, longitudinally and laterally, in such manner as to permit each type to be brought to a given position, at the will of the operator, to be pushed upon the paper by the plunger or its equivalent. "2d, I claim the combination of the two motions, which I have called lateral and longitudinal, for the purpose of bringing the type or character required in position to make its impression.

"3d, I claim the wedge-shape movement in combination with a type form, substantially as described and represented, for the purpose of giving motion to the latter.

"4th, I claim the manner of adjusting with precision the required position of the type form, by the use of gauges, substantially as described and represented, in combination with the two motions already described as giving motion to the type form, or in any combination substantially the same.

"5th, I claim the inking of the types, by the inker interposed, during the action of the machine, between the face of the types and the paper.

"6th, I claim the use of the bob, substantially as described and represented, to furnish the power to cause the pressure on the types, or the inking of the same.

"7th, I claim the combination of the bob, whose fall produces the pressure on the types, with a contrivance by which, after the blow is given, a second blow or vibration is prevented.

"8th, I claim the use of the slats, substantially as described and represented, or other analogous device, controlling the motion of the machine, combined with the rods answering to the letters or characters wanted, by means of the catcher on which the slats may be moved separately or together, in any combinations of time or extent of motion that may be required for the action necessary to produce the given character.

"9th, I claim the draft rod and lever, in combination with the slat, or its equivalent, to produce the various movements required to control the types."

22. For an Improvement in Horse-Shoe Machinery; Samuel S. Greene, Lowell, Middlesex county, Massachusetts, November 12.

Claim. "What I claim, is the combination of the two flanched rotating dies arranged with respect to each other, and operating substantially as herein described; said dies being so shaped as to give the requisite form to the metallic shoes of animals."

23. For an Improvement in Drying Paints; Aquilla Jones, City of New York, No

vember 12.

"The nature of my invention consists in providing a new material as a drying substance to be mixed with linseed or other oils, to be used in zinc and other paints, in order that the oil so prepared will cause the paints to dry more effectually than in the known pro

Claim. "What I claim as my invention, is a method of giving a drying quality to oils by the use of a mineral commonly known by the name of the "Red Oxide of Zinc," VOL. XXI.-THIRD SERIES-No, 1.—JANUARY, 1851.

in a partially deoxidized state, and either in combination with those substances naturally associated with it, or by the use of any of its component parts, separated by mechanical means."

24. For an Improvement in Iron Railings; John Krauser, Sommers Crowell, and Cyrus Krauser, Reading, Berks county, Pennsylvania, November 12.

Claim. "What we claim as our invention, is the combination of rods, tubes, and pailings, with the manner of operating the same, as herein set forth and described."

25. For an Improvement in Cooking Stoves; Samuel Pierce, Troy, Rensselaer county, New York, November 12.

"My invention consists in heating the front end of the said oven with hot air, by causing air to enter a heating chamber back of the fire-back, and then to pass along a flue or flues in the hearth to the front end of the extended oven, and thence through the oven, escaping into the back fire flues of the stove through holes in the back oven plates; the exhausting action of the draft in the fire flues inducing the required current of heated air as above indicated. In this way I am enabled to produce, by a single device, the double effect of heating the front end of an extended oven, and at the same time to keep up a circulation of heated air in and through the oven."

Claim.—“What I claim as my invention, is the method of heating the front end of the extended part of the oven, in combination with, and receiving the heated air from, the hot air chamber behind the fire back, and causing it to pass through the oven and out into the fire flues, in the manner substantially as described, and for the double purpose of heating the front end of the oven and passing a current of heated air through the oven, substantially as specified."

26. For an Improvement in Sewing Machines; Allen B. Wilson, Pittsfield, Berkshire county, Massachusetts, November 12.

"The nature of my improvements, which are applicable to a machine in which two threads are used, viz: one passed through the cloth by a needle leaving a loop through which another thread is passed by a shuttle, consists, firstly, in an improved mode of operating the vibrating arm which carries the needle; secondly, in an improved mode of operating the shuttle by which I can pass a thread during each of its motions, one during its motion in one direction, and another during its motion in the opposite direction; and thirdly, in an improved mode of holding and moving the cloth to be stitched."

Claim. "What I claim as my invention, is forming a stitch by each throw of the shuttle and corresponding motion of the needle; that is to say, making one stitch at each forward and another at each backward motion of the shuttle; this being effected by the needle in combination with the shuttle, both constructed, arranged, and operating as herein described, or in any other mode substantially the same.

"2d, I claim the combination of the sliding bar, the plate, r, the feeding plate V, the spring, the screw, the lever, and the clamping plate, for holding and feeding the cloth to the needle and regulating the length of the stitch, in the manner herein described, or in any way substantially the same."

27. For Hinged Gun-Harpoons; William Albertson, New London, Connecticut, November 19.

"The nature of my invention consists in making the shanks of harpoons, or other whale irons, with a hinge joint at or near the middle of their length, which admits of their being folded, and inserted nearly up to the head, within the barrel of a gun, being so formed as to fit easily in the said barrel; the line is made fast to the shank close to the head and also at the end, the part of the line between the head and the end of the shank which lays close to the shank during the flight of the harpoon, or while the shank is straightened, is folded when the shank is in the gun, and hangs outside in the form of a loop: by this contrivance the line can be made fast to the end of the shank, as well as near the head, without placing it in the barrel of the gun, and the shank (each joint being in the form of half a cylindrical tube, or otherwise hollowed out for the sake of lightness) may be made to fit the barrel of the gun so as to be capable of being projected with great accuracy, without rendering it necessary to make it of great weight."

Claim. "What I claim as new in my invention, is, making the shank of harpoons and other whale irons, to fold by a hinge or joint at any convenient point in their length, in the manner and for the purposes substantially as herein described."

28. For an Improvement in Bake Ovens, Hosea Ball, Philadelphia, Pennsylvania, November 19.

Claim. "What I claim therein as new, and of my invention, is, the combination and arrangement of an endless chain platform, with the oven, by which arrangement the unbaked bread or other articles being put in at one end, are discharged at the opposite end completely baked; and in combination therewith, I claim the self-opening and closing door, arranged substantially as herein set forth."

29. For an Improvement in Working the Doors of a Bee-hive; Jarvis Case, Selma, Ohio, November 19.

Claim. "What I claim as my invention, is the arrangement of the bee boxes and moth chambers, in combination with the sliding screen doors, pulleys, and levers, as described, so that the doors may be worked by a single movement of the lever, in the manner and for the purposes set forth."

30. For an Improvement in Air-heating Furnaces; Gardner Chilson, Boston, Massachusetts, November 19.

Claim. "What I claim as new, is, 1st, the annular chamber, constructed and arranged substantially in the manner and for the purposes set forth-with or without the cross pipe.

"2d, I also claim the mode of conducting off the products of combustion from the fire through ascending pipes, into an annular chamber, and thence into a central descending pipe to their exit; and the surfaces being all so constructed of a curved figure, as to allow a diverting influence, and free circulation to the exterior air in the air chamber, to be warmed without over-heating it; while it is, by the arrangement of parts, forced to impinge directly against the heated surfaces.

"I also claim the method of setting the furnace, consisting of a double-walled chamber, the inner wall of which encloses a cold air trench, supplied from without, that surrounds the ash-pit, with openings at its top for the proper admission of air into the air chamber around the furnace, and with lateral openings into the space between the walls to cause an upward current, which is connected with the warm air pipes leading to the apartments, by means of which a constant and pure supply of air is insured, and the heat greatly economised."

31. For an Improvement in Corn Shellers; David Eldridge, Philadelphia, Pennsylvania, November 19.

Claim. "What I claim as new and my improvement, is the combination of the wheels, C, D, and E, for shelling corn, as herein described."

32. For an Improvement in Mills for Grinding and Crushing; William Frost, City of New York, November 19.

"The nature of my invention consists in the use of a round cylinder mounted on a shaft, and driven by hand, steam, or other power, in grooves of the cylinder; inside are crushers or rollers of a peculiar form, containing, if necessary, similar crushers within themselves all of which when the cylinder revolves rotate by the friction against their peripheries and are used for breaking, bruising, or grinding different substances put into the cylinder, the outlets and inlets for the material operated on, also the crushers and position of the machine, being made according to the particular purpose for which the machine is intended."

Claim. "What I claim as my improvement is the use of the cylinder, grooved and notched, or smooth, being made to rotate, and having within it any number of crushers, formed as described, for the purpose of pounding, grinding, or mixing any substance; the crushers either running singly or for the purpose of working different substances simul

taneously one within another; the jumping bar or pins at N, in combination with the arrangement shown, or any other arrangement substantially the same."

33. For an Improved Annunciator or Bell Telegraph, John Garvey, City of New York, November 19.

Claim. "What I claim as new and of my own invention, is the combination and arrangement of the spring levers, suspended bar or striker, with the pendulums and bells, for simultaneously indicating the number of the room, and calling the attention thereto by giving the alarm; there being a secondary or intermediate fulcrum bar against which the spring lever impinges on its descent, increased by the spring by which the rear end is made to descend, and with it the suspended striker, upon the bells, and at the same time suddenly elevating the front end of the lever, and imparting a vibratory movement to its pendulum; said spring levers being provided with oblong openings or slots, through which the fulcrum bar passes, for producing the aforesaid action of the spring levers on its descent upon the intermediate fulcrum bar, as described and represented."

34. For an Improvement in Photographic Pictures on Glass, &c.; Frederick Langenheim, Philadelphia, Pennsylvania, November 19.

"The nature of my invention consists in placing a semi-transparent material or substance, for example, ground or frosted glass, in front or behind the said transparent picture, the effect of which is to concentrate the light in the ground or frosted glass, at the same time preventing objects behind the picture from being visible through the lighter or more transparent parts of the picture, and which ground or frosted glass also protects the picture from external injury."

Claim. "What I claim as my invention, is the combination of the ground or frosted glass, or other semi-transparent substance, interposed in connexion with the picture, between the source of light and the spectator, substantially as described in the foregoing specification."

35. For a Method of Attaching Augers to their Handles; John E. Larkin, Ballston Spa, Saratoga county, New York, November 19.

Claim. "What I claim as new in my invention, is the handle, made in two parts, one of which, D, fits in a socket on the other, A, and carries a bolt screwed at its end; the said bolt passing through a hole in the auger shank, and screwing into a female screw or nut in the part A, for the purpose of clasping or firmly holding the auger shank between the ends of the parts A and D of the handle or stock, substantially in the manner herein described."

36. For an Improvement in Copper and Steel Plate Printing Presses; Elijah C. Middleton and Edward Nevers, Cincinnati, Ohio, and Robert Neale, Mount Carmel, Ohio, November 19.

Claim. "What we claim therein as of our invention, is, 1st, the arrangement of a tooth or catch projecting from the roller, and operating upon a tooth or projection upon the platen for the purpose of starting the platen and causing the commencement of the convexity of the roller to impinge upon any required point of the length of the platen, for the purpose described.

"2d, The combination of the racks with the cog wheel attached to the connecting rod of a gang of rollers, together with the beads and the grooves in the rollers for security, uniformity of action, and a proper relative position between the platen and the supporting rollers upon which it traverses, thus preventing lateral and longitudinal aberration. "3d, The method of heating and retaining at a suitable temperature the plates from which the impressions are to be taken, by means of lamps, or of vessels containing inflammable material, placed under the upper plate of the platen or traversing bed, within the recess formed between that and the plate resting immediately upon the gang of rollers.

"4th, The arrangement of a stationary and sliding clamp, adjustable longitudinally of the platen, for securing the plate in position, substantially in the manner described.

"5th, We claim in combination with the D roller the method of retracting the platen by the weighted cord, assisted by making an inclined plane of the bed on which the rollers traverse."