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MR. READMAN'S BAROMETER, iron, and dovetailed the one into the other; Sir,--Having read the communication of after which, the nave is to be cast on the Mr. Coathupe, in your Journal for October ends of the spokes. The patentee also gives 22, relative to my improvements in baro his spokes a peculiarly curved form ; but to meters, in which he lays claim to priority of this he makes no claim. invention, on the ground of a letter which Thomas HEDLEY, OF NEWCASTLE-ONhe addressed to the editor of the Meteoro TYNE, GENTLEMAN, AND CUTHBERT Rod. logical Journal, in February last, I beg HAM, OF GATESHEAD, MILLWRIGHT, for leave to inform that gentleman, that, in ad. an apparatus for purifying the smoke, gases, dition to your testimony, Mr. Editor, in my and nauseous vapours, arising from certain favour, I am able to bring forward evidence fires, stoves, and furnaces. March 7, 1842. to prove that my invention had been matured A revival of the plan, patented (we rather by me full half-a-year before the publication think, more than once,) many years ago. of his letter.

The smoke or vapours are caused to traverse From the concluding paragraph of Mr. two shafts, one ascending and the other de. C.'s communication, the reader would be

scending, from the top of the latter of which apt to infer that the inventions of that gen a shower of water is constantly falling, which tleman and myself were identical, whereas washes the smoke or vapours free from all the principle of suspending or placing the impurities. The only difference between cistern of the barometer on a spring or ba this and the former plan is, that six flues are lance is the only point in which they do employed instead of two ; that is to say, agree; the purposes to which that principle three ascending flues, and three descending, is applied being totally different. The use or shower flues. to which I have applied this principle, and HENRY BARRON RODWAY, OF BIRMINGwhich constitutes the chief value of my in HAM, WINE MERCHANT, for improvements vention, consists in the substitution of the in the manufacture of horse-shoes. March weight of the mercury in the cistern, instead 7, 1842. of the length of the barometric column, as Every person must have noticed that, in the index of the atmospheric pressure, by a horse-shoe, as commonly made, there is a which means several defects in the barometer

small groove towards the outer edge, to reare obviated. Now, the sole use to which ceive the heads of the nails, by which the Mr. Coathupe, in his letter, proposes to ap shoe is secured to the foot of the horse ; ply the same principle consists in the self and, if he has a nice eye for proportions, he adjustment of the surface of the mercury in may also be able to call to mind that this the cistern to the zero point of the scale. groove is commonly about a quarter of an The identity of the two inventions, there. inch wide-never so much as three-eighths. fore, the reader will perceive, extends no On these rather minute premises there is farther than to the principle on which they here built an astonishingly sweeping patent. . are founded.

“ Nobody," quoth Mr. Rodway,“ has I remain, Sir,

made horse-shoes with a groove exceeding Your obedient servant, three-eighths of an inch. I will, therefore,

JAMES READMAN. (happy thought !) monopolize to myself that November 9, 1842.

width, and all beyond it." His actual

words, in the specification before us---duly ABSTRACTS OF SPECIFICATIONS OF ENGLISH

signed, sealed, and enrolled-are these : I PATENTS RECENTLY ENROLLED.

do not claim the making of horse-shoes with JAMES CLEMENTS, OF LIVERPOOL, for grooves, generally, but only such grooves as certain improvements in composition for are at least three-eighths of an inch wide." ornamenting glass and picture frames, and Make them of Paths, or Hindths, or 4ths of articles for interior and other decorations ; an inch, or of any size, however small, less also, for the manufacture of toys and other than gths of an inch, and you are safe ; but carriages. Patent dated, March 4, 1842. only make them of the patent fths width,

The pulp of potatoes, boiled, roasted, or or one hair's-breadth beyond it, and you steamed, is to be mixed with some suitable shall have a costly, perhaps ruinous law-suit binding material, as fine saw-dust, ground for your pains. brick, &c., and this, it is said, will form By such patents as this, the encouragea composition, which may be cast in moulds ment given by the law of the country to new of any ornamental form desired.

inventions is not used for its legitimate purEDWARD SLAUGHTER, OF BRISTOL, poses, but most grossly abused. ENGINEER, for improvements in the con CHARLES WILLIAM FIRCHILD, OF Wes. struction of iron wheels for railway, and other LEY PARK, WORCESTERSHIRE, FARMER, fancy articles. March 4, 1842.

for an improved propelling apparatus for The spokes and tire are to be of malleable marine and other purposes. March 14, 1842.

1

A pair of steam-engines are to be employed, These improvements consist, first, in manu. as usual in steam-vessels, but the cylinders facturing the sulphate of soda by adding to are to be fixed horizontally in the stern of 20 cwt. of common salt, contained in a close the vessel, and the piston-rods are to pass leaden vessel, 30 cwt. of sulphuric acid, " of through the cylinder both at top and bot 1.71," and heating the said vessel, extertom. The inner ends of the pistons are to nally, to from 300° to 330° Fahr.; and, sebe connected with a, crank-shaft, and the condly, in manufacturing chlorine, by em. outer ends with a secondary pair of pistons, ploying "the vapours of muriatic acid act of a square form, which are to work in two on manganese immersed in water, such vapour hollow square chambers open to the water being conducted below, and permitted to behind. The notion (evidently a very fool escape upward, through the water and ish one) of the patentee is, that the alternate manganese." action of his circular pistons on his square JOSEPH CLISOLD DANIELL, OF TIVERTON pistons, and of his square pistons against Mills, for improvements in making and the columns of water admitted from behind, preparing food for cattle. March 31, 1842. will propel a vessel forward much more ef Birch brooms, or furze fences, are to be fectually than paddles, screws, or any thing made good food for cattle, by grinding them else, we presume, yet invented for the pur to fine powder, and mixing them with pose.

some corn and a good deal of chaff. Strax M. S. Beach, OF NORFOLK-STREET, and hay is also to be made as fresh and sucLONDON, PRINTER, for improvements in culent as new-mown grass or clover, by machinery used for printing with type, and throwing a bundle of the former and two in the construction of type for printing. bundles of the latter into a close vat or tank, March 23, 1842.

and steaming them together for twenty-four The general object of these improvements hours. is, to extend what may be called the cylin Mr. Daniell is a great dealer in agricul. drical system more generally to the art of tural nostrums. letter-press printing than has yet been done. RAOUL ARMAND JOSEPH JEAN COMTE With this view, the patentee proposes that DE LA CHARITE, RICHARD TAPPIN CLAthe types, instead of being set up, as at pre RIDGE, OF WEYMOUTH-STREET, GENTLEsent, in flat composing-sticks, should be set MAN, AND ROBERT HODGSON, OF Salisup in sticks of a circular, or partly circular BURY-STREET, STRAND, GENTLEMAN, for form, and the types themselves be tapered improvements in preparing surfaces of fato suit that form ; that, besides using rollers brics to be used in covering roofs, floors, for feeding the paper and inking the types, and other surfaces. April 26, 1842. as in the present machine printing, the types These improvements consist in coating also should be adjusted on rollers; and, canvas with a composition called by the pafinally, that the paper, instead of being sup tentees, “ Oropholithe." It consists of the plied, as it now is, in separate sheets, should following ingredients, well mixed together : bé supplied in continuous lengths, of as Linseed-oil, 8 parts; many yards as

a shaft will conveniently Litharge, or white-lead, 4 parts; carry, and cut off, at any distances required, Dry powdered whiting, 9 parts ; by knives suitably placed and acted upon for Dry sand, 36 parts. the purpose. Subordinate to these principal If a light-coloured oropholithe be required, improvements there is an apparatus for then unboiled linseed-oil must be used. If damping and pressing the paper; and also a a particularly tenacious cement be not renew sort of hand-press, for taking proofs. quired, or if of a darker cast, boiled linseedThe specification of the patentee is illus oil is used. Any colour can be given to the trated by no less than thirty-two drawings; oropholithe, by using colouring matter of and it needs them, for, taken by itself, the required shade. The whiting and sand ti is very confused, (what printers would must be quite dry, and passed through a call of the pie order,) and any thing but in fine sieve previous to mixing. telligible. Of Mr. Beach's improvements The thickness of the composition depends themselves it is impossible to speak in terms on the service for which it is required. If of too high praise; they are all of them ex for places not exposed to wet, the composiceedingly ingenious, all more or less feasible, tion is only laid on one side of the fabric, to and some, (the supply of the paper, for ex the extent of sth of an inch; if for places ample, in continuous lengths,) of obvio exposed to the wet, it is then laid on both and unquestionable utility.

sides. Julius SEYBEL, OF GOLDEN-SQUARE, The claim is to the composition for cover. MANUFACTURING CHEMIST, for improve- ing roofs, floors, and other surfaces, consistments in the manufacture of sulphate of ing of the materials before mentioned, in the soda and chlorine, March 31, 1842. proportions specified.

RECENT AMERICAN PATENTS.

Jo.

JOSEPH WARREN, OF HEYBRIDGE, for pliances, by means of which (after the furcertain improvements in ploughs. May 9, nace-door is closed) it is gradually brought 1842.

to a state of equilibrium or rest, and the airThe present improvements are six in num passages to the furnace closed. ber.

The first consists in regulating the depth to which the share of the plough is inserted in the ground by means of a wedge (Selected and abridged from the Franklin Journal (acted on by a screw) which is passed under

for September, 1812.] the ploughshare from behind, and in pro IMPROVEMENT IN FIRE-ENGINES. portion as it raises it at the back, depresses seph B. Babcock.--The cylinders and pistons, it in front; also in regulating the height and or plungers, are placed horizontally, and elevation of the beam, to suit the general these cylinders, with the part of the appara. line of draught by a peculiar combination of tus to which they are attached, are secured shifting bolts and screws.

down to the bottom of the eistern. The pisThe second improvement is a modification tons, or plungers are hollow, and are proof the second branch of the first.

vided with valves for the admission of the The third consists in a mode of raising at water into the cylinders ; they are attached pleasure, the frame of the plough at the to the ends of a square frame, inside, the back part so as to depress the ploughshare side pieces of which are provided with racks, in front. An upright rod connects the sole into which the teeth of two segment cog at the after part with the top and bottom wheels work, said segments being attached parts of the frame, which rod is screwed at to the brake. that part where it passes through the bottom IMPROVEMENT IN BEE-HIVES. John M. part of the frame, so that by turning it round Weeks.—What is claimed as constituting (by a spanner, or any other convenient this invention, and not previously known in means,) the back part of the frame is de. bee-hives, is a mode of regulating the ventitached from and raised above the sole, and lation of the hive by means of tubes lined the ploughshare in front is proportionally with wire gauze, and having apertures to depressed.

which adjustable caps, perforated with similar The fourth improvement consists in giving apertures, are adapted. Also, combining the ploughshare, when intended to be used a central box, and one or more collateral in the tilling of stony land, a more elon boxes, containing smaller hives, with a mode gated and pointed form than usual.

of ascertaining and regulating the temperaThe fifth improvement consists in a double ture of the hives, by means of a thermobreasted plough, of which the chief peculiarity metrical and ventilating apparatus. is, that the mould boards are so curved that CANAL LOCK. Robert English. The they present an outline continually receding patentee calls this “the air and water-acting or diverging outwards from the base to the sympathetic canal lock-gate.". upper extremity.

At the upper end of the lock, which is the The sixth and last improvement consists subject of this patent, there is to be an air. in a wheel plough for making drains, which tight chamber, provided with what the pa. seems likely to answer the purpose well, but tentee calls “sympathetic gates," which are the construction of which, could not be made hinged to the lock in such a manner as to clear to the reader without the aid of the shut one upon the other, the lowermost being explanatory drawings.

provided with an air-tight float. Below WILLIAM RICHARD, .THE ELDER, or these two gates there are two valves, one of BARLEY-Mills, LEEDS, MANUFACTURER, which communicates with the water in the for an improved method of preventing and upper chamber of the lock, and the other consuming smoke, and economizing fuel in with a culvert leading to a lower level. steam-engines. July 7, 1842.

When the first-named valve is opened, the A pneumatic apparatus, precisely similar chamber below the gates is filled with water, in principle and action to the well-known which acting on the float, forces up the (station) gasometer, is here applied to the gates, and thus closes the lock; and when purpose of_supplying atmospheric air to a this valve is closed, and that leading to the furnace. Every time the door of the fur. calvert opened, the water running out of nace is opened to throw on fresh coals, it the chamber to a lower level, leaves a partial acts on certain levers which simultaneously vaccuum below the gates, which are conseopen the passage to a number of air-holes, quently forced down by the pressure of the formed at the back of the bridge, (à la Wil. atmosphere, aided by their own gravity ; liams,) and set the gasometer-like apparatus a communication is thus opened between the or bellows to work ; and this air-feeding upper and lower levels. Where the water apparatus is provided with certain other ap- discharges from the upper to the lower level,

TENONS.

WITH

there is a breakwater attached by hinges to the wick compressed between them being inthe lock to prevent the water from rushing serted into the annular space between the two too suddenly on to the boat in the lower cylinders of the wick case, with a portion of lock.

said wick tubes extending above the wick MACHINE FOR CUTTING DOVETAILS AND case, to allow of their being kept cool by the

Thomas J. Wells.—The construc draught; and also for combining with the tion of this machine exhibits much mechani outer cylinder of the burner and the rod cal skill. The cutters are attached to the supporting the button, a moveable cylinder, periphery of a wheel on the end of a man or screw, disconnected from the rod, but drel, and the wood to be tenoned is put on having a button plate which, when the cylin. to a second mandrel, parallel to the first, der is turned up, presses against the rod the two being made to turn in the same di. and elevates it ; and allows it, when turned rection, and with equal velocities. If the down, to return either by its own weight, or tenon is to be of four sides, four cutters are by the action of a spring." so arranged as to divide the periphery of the PORTABLE SAW MILL, FOR SAWING cutter wheel into four equal parts ; and if TIMBER

THE CIRCULAR SAW. the tenon is to be cut on two sides only, then George Page.--In this mill, the shaft of the two cutters are employed, and placed oppo çircular saw has its bearings longer than the site to each other. As the cutters revolve width of the boxes in which they run, so as they gradually approach the axis of the se to allow it to have free end play, and the cond mandrel, on which the wood is placed, saw is embraced on each side, just back of until they reach a line passing through the the teeth, between two friction rollers, which axis of the two mandrels, and then they gra. serve to guide it. Each of the guide rollers dually recede from it.

is attached to a separate plate, the two plates The claim is to the before-described being placed one above the other, and pro. !" mode of cutting tenons, or dovetails, or vided with a slot for securing and setting the other forms, by a similar, simultaneous, rollers. The carriage is made in sections rotary motion of the circular plane, and for the convenience of transportation, the substance on which the tenon, dovetail, or different sections being united by means of other form, is to be made: the cutting being a rack rail at the bottom. performed on an increment tangential line to INDELIBLE INK. Thomas J. Spear.the circumference of the revolving circular The following is the whole of the specifica. plane, whilst the cut made forms the chord tion, viz :-"Take three drachms of the line of a segment, on the piece of the circu. least bruised India ink, and four ounces of lar rail cut away by the revolving cutter." boiling solution of caustic soda, and mix these

AN IMPROVED BRIDGE. Earl Trum. together, and shake the mixture well for bull.-This bridge, as described, is to be about ten minutes, when the indelible ink constructed of iron. It consists of arched is produced.” truss frames, made in sections, the end of MACHINE FOR CUTTING SHEET TIN, OR each section having a half post, and this, OTHER SHEET METAL, AND GLASS, An. when united and tied to the half post of the drew Tracy.--This machine differs very next section, forms an entire post. These little from other machines for the same pur. sections are farther sustained and connected pose, which have been patented. The plate together by suspension rods, which run from of metal to be operated on is held between the upper part of one end section to the two plates, each of which is attached to a other, passing under the bottom of the mid. rotating spindle, the uppermost being pro. dle section ; and by tie rods that run from vided with a spring, which bears it up when end to end along the lower line of the truss. not acted upon by an eccentric lever, by The truss frames are connected together by which it is forced down to hold the sheet of transverse cast iron beams, or sills, on which metal. The spindle of the upper plate is the floor is laid, formed of a bottom and top provided with a leyer, with which to turn it plate connected together by diagonal braces, when desired ; it is furnished with a pall, all cast together. In addition to these, the which catches into the teeth of a ratchet trusses are farther connected by diagonal tie wheel attached to the spindle. In operating rods, running from section to section, under with this machine, either the bolding plates, the floor.

with the sheet metal, may be made to turn, IMPROVEMENTS IN THE ARGAND BURN or the shears may be carried around the ER, FOR BURNING CAMFHINE AND OTHER holding-plate, at pleasure. CHEMICAL OILS. Stephen J. Gold.The IMPROVEMENT IN THE COOKING STOVE, claim is to the "mode of compressing the CALLED THE FRANKLIN ECONOMY COOKwick by means of two thin, moveable, me ING STOVE." Mathew Stewart.-This store tallic, cylindrical tubes, combined with the contains a reflecting oven, the form of which wick case, the two cylinders or wick tubes with is that of two truncated pyramids, united

at their bases, the inclined surfaces being nexion in the double rail are avoided, as intended to concentrate the heat in the centre. well as the expense of two-thirds of the land Each end of the oven is attached to a semi. over which it passes. The only question cylindrical furnace, the chords of which are appears to be, how far these are objects towards the centre of the oven. Over the worth attaining ? furnaces there are openings for smoke pipes, It has been said, that if commerce is beand for cooking utensils.

nefited by the greater outlay, no matter for FLOUR MILL. Andrew D. Worman. the ultimate loss to individual share-holders ; The middlings, which are to be mixed with but this, to me, is problematical, and hence the fresh ground chop from the burs, are I conclude that, in a single railway, the time put into a hopper prepared for that purpose, lost in crossing at the central point is of no which hopper is so placed that the middlings consideration, where the object is such im. contained in it shall be conducted from it mense saving. And now, Sir, as I think I into the spout or trough, in which the ele. can make out that in the single railway, of vators are carrying up the fresh ground which I have made a correct model, I can wheat to the hopper boy; and to the hopper considerably lessen the expense of the rail, containing the middlings is appended a shoe render it more durable, and put it in its and a sliding shutter, in the ordinary way, place by the aid of any common labourer, I for the purpose of regulating the feed from will endeavour, unassisted by either plan or them. In this way the middlings will be model, to give your readers some idea of the perfectly and equally distributed and mixed improvement. among the fresh ground chop, and will be, My new rail consists of only two pieces, in this state, carried through the respective viz : the transvervse cast iron sleeper, and processes to which the flour is subjected, the railway beam, of which the following is until it is ready to be packed.

a description. The base of each transverse HARPOON FOR TAKING WHALES. Wil piece is composed of two square slabs, mealiam Carsleys.--The flukes or barbs of the suring 4 feet each way, and i inch thick, conharpoon are to be so twisted, as that, after nected together by a third slab of 2 feet in being thrown, it shall, on entering the body length, if foot in breadth, and 1 inch in of the animal, cut its way in an oblique or thickness. On each of the first slabs, in spiral direction.

their exact central line, are erected two tri. IMPROVED MODE OF PROPELLING SHIPS angular brackets, whose base is 1 foot long, BOATS, AND OTHER VESSELS. Elisha F.

and perpendicular side, eleven inches; these Aldrich.-In this improved mode of pro brackets are cast with the slab, so that the pelling boats, &c., the wheels are construct two slabs, the piece that unites them, and the ed with permanent radial paddles, the ends four brackets, are cast in one mass. These of which abut against the rims of the wheels, two brackets are so separated as exactly to so that the principal part of the water against receive and confine the rail, which when laid which the paddles act has to pass in between down occupies only half their breadth, the them, through the space between the inner other half of which is left for the reception periphery of the rims and the centre, or hub, of each succeeding rail. The longitudinal and is forced out by centrifugal power against sleepers are of wood 1 foot square, and 10 the water-back of the wheel, thus impelling feet long, and each of the ends as far as it the boat forward. The wheels constructed projects upon the square slab, is morticed in this manner are placed either in hollow away 1 inch of the lower surface. The iron trunks or cases, within the vessel, or in si rail reposed upon them, in its section re. milar cases built outside, and open at the sembles the letter T inverted (L), with its bottom, the wheels projecting below the upper edge rounded off ; and this iron rail is bottom of the trunks or cases; or they may, secured on the longitudinal sleepers by imit is said, be placed horizontally, and act on bedded screws.

Your readers will see by the water at the sides of the vessel.

this arrangement, that the transverse pieces and sleepers, will all repose on the same level, and that the morticed parts and brackets

will look them together, and thus secure the Sir,-Your polite invitation to me to regularity of the line. make any further observations which might The peculiar form of the iron rail will, I seem to me to be requisite in recommenda apprehend, weigh less by the foot than the tion of my single railway, induces me to most elevated of Mr. Brunel's rails on our trouble you with the following remarks. Great Western, and offers to the wheels of

The advantages of a single rail over a the carriages a rounded saddleback, which is double one must mainly consist in the sav incapable of retaining loose bodies that may ing of expense, which will always be more fall upon it, and is intended to carry wheels than half, inasmuch as all the links of con whose circumferences are grooved into the

SINGLE LINE RAILWAYS.

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