tail of cast iron or brass with a wrought iron or brass tenon to fit therein, to be secured by a spring bolt or collar. TO JAMES FRASER, of Long Acre, in the parish of St. Martin-in-theFields, for his Invention of a Junction of Tunnels in a Boiler, for the purpose of Lessening the Appearance of Smoke, and for Lessening the Consumption of Fuel.--Dated Nov. 12, 1818. This improvement consists in a vertical with a horizontal tunnel in a boiler, or in other words, both these tunnels are in the midst of the water. The horizontal tunnel is the supposed fire-place, and the vertical tunnel supplies the horizontal with fuel from above, so that the fire immediately under the vertical tunnel, on the top of which is a door and register; also when the smoke is required to be burned, this register will admit of suificient air to effect combustion, and beat the smoke down into the ignited coals, and thereby lessen its quantity. The vertical hopper will also supply the boiler with a quantity of coals, so that for ordinary purposes, such as for heating by steam, it may be left several hours; supplying itself regularly with coals, without attendance. From the junction of tunnels above-mentioned, the fire and hot air descend to the secondary flue under the boiler, pass nearly its whole length from back to front, then turns right hand and left under the bottom to the sides, and then to the chimney. There are two flues issuing from the fire or horizontal tunnel, which meet the main flue, and present a more enlarged surface of flame and hot air to the water, and these flues may be made to pass out at the ends of the boiler, parallel with the horizontal tunnel, and then be made a common vortex. Bricks also may be placed at the flues and end of the fire; this will prevent the boiler from being burned, and will assist in bringing down the regular supply of coals from the vertical tunnel. The above horizontal tunnel is supposed the primary and essential flue; what he calls the secondary flue is, in fact, the primary one of many boilers now in use, and my primary or horizontal is their secondary one; but the junction of a horizontal, with a vertical tunnel opens a communication in the inside of a boiler, that independent of MONTHLY MAG. No. 339. its convenience, presents many advantages, supposed unattainable in ebullition of ten hours' continuance, a more rapid combustion, and an enlarged surface.-London Journal of Arts. To MESSRS. SIEBE and MARRIOT, of Fleet-street, London, for an improved Weighing Machine.-Dated June, 1817. This invention consists of a box or frame containing a flexible ring, or a spring of a round or oval form, or two springs conjoined together, so as to produce the effect of a circular or elliptical endless spring. The suspending part or handle is attached to the box and upper side of the flexible ring, and the pendant rod, with a hook for the purpose of receiving a scale, is attached to the lower side of the ring, consequently the ring becomes elongated by the weight applied in the scale to the pendant rod; and, in order to measure the weight or power exerted upon the spring, a small compound lever attached to the top of the pendant rod, is connected with an index moving upon a centre arbour, which index, by that means, is carried round a dial plate, indicating the weight in the scale below. Several modifications of this principle are proposed by the patentees: as in the form of the spring, which may be of two or more pieces, bent in various forms, but so conjoined together as to produce the effect of an elastic ring; they likewise avail themselves of the use of a compensating spring, in order to regulate the power of the principal spring, in the event of its being affected by the different degrees of temperature; they propose also, instead of the compound lever moving the hand or index as above, to apply a rack to the top of the pendant rod, which shall work into a pinion upon the axis of the index, and by the lowering of the pendant rod, turn the pinion carrying the index, which, upon the face of the dial indicates the power excited upon the spring, or, what is tantamount, the weight of the articles in the scale. Upon the whole, the patentees confine their exclusive claim to the adaptation of a circular or elliptical spring as above described, for the purpose of a weighing machine; not claiming any of the other parts, as the levers, or rack and pinion, they having been long known to be in use, combined with other contrivances for the same pur poses. VARIETIES, LITERARY AND PHILOSOPHICAL. Including Notices of Works in Hand, Domestic and Foreign. E have the satisfaction to present to our readers a specimen of MESSRS. PERKINS, FAIRMAN, AND HEATH'S Siderographia, or mode of engraving upon steel,and then transferring the same to steel or other metals. This invention deservedly demands while it receives the admiration of every lover of the Fine Arts; and at the same time it presents the means of perpetuating whatever is beautiful in the art of engraving, and will probably produce a general refinement in the taste of the public by furnishing engravings of the inost beautiful kinds, at the same cost as those of inferior execution.-The advantages to be derived from the use of this invention are various; but that to which it has been applied almost exclusively, and with perfect success, has been to SECURE PAPER CURRENCIES FROM FORGERY; an object not before attained by any other plan, but of prime importance as it respects national morality; which cannot be maintained except by the absence of temptation to crime. To prove more clearly the merits of this invention, we have been furnished by the proprietors with impressions from a hardened steel plate, upon which is shewn a part of the various styles of work made use of by them though, it is unlimited in this respect, as etchings, graving and engine work of every kind are within their reach. Having been permitted to examine the Siderographic process, . we proceed to lay a concise account of it before our readers. Steel blocks or· plates of sufficient size to receive the intended engraving are softened or decarbonated upon their surfaces, and thereby rendered a better material for receiving all kinds of work than even copper itself. After the intended work has been executed upon the block, it is then hardened with great care by a new process which prevents injury to the most delicate work.-A cylinder of steel previously softened is then placed in the transferring press, and repeatedly passed over the engraved block by which the engraving is transferred in relief to the periphery of the cylinder, the press having a vibrating motion equalling that of the cylinder upon its axis, by which new surfaces are presented equalling the extent of engraving. This cylinder is then hardened, and is ready to indent either copper or steel plates, which is done by placing it in the same press before described, and repeatedly passing it over the copper or steel plates, thereby producing another engraving identically like that upon the original block; and this may be repeated upon any required number of plates, as the original engraving will remain to produce other cylinders if ever required, and when transferred to steel plates and hardened, these will also serve as additional matrices for the production of new cylinders. This invention promises to be of great advantage to some of our manufactures, particularly that of pottery, which may now be embellished with beautiful engravings, so as to place the successful competition of other nations at a more distant period. It may also be applied with great advantage to CALICO printing, by producing entire patterns upon the cylinders from which they are printed, an object of great importance to our manufacturing interest. These are among its obvious applications; but as a means of rendering Forgery IMPRACTICABLE, it claims the attention of statesmen and the gratitude of philanthropists, who shudder at the hundreds of victims which are now immolated to the laws by the facility with which they may be violated. The association of Mr. CHARLES HEATH with the American inventors is a fortunate circumstance, as it affords a pledge, that all which is exquisite in art will be combined with the ingenious mechanical inventions of Mr. PERKINS and the perseverance of Mr. FAIRMAN; and be the means of conferring every desirable perfection on the various applications of the Siderographic process. new Plan for preventing BankNotes the Bankers United of the utted Kingdom)) TY BY N PERKINS, FAIRMAN, & HEATH, 69 Fleet street Die Pound London • Perkins, Fairman & Heath, PRINCE MAXIMILIAN'S Travels in the Brazils, which have excited so great an interest, owing to the quality and character of the traveller, will speedily appear at large, with many engravings, in the Journal of New Voyages and Travels. In May will be published, Travels in Sicily, Greece and Albania; by the Rev. T. S. HUGHES, fellow of Emanuel College, Cambridge. The first of these volumes will contain a Classical Tour in some of the most interesting parts of Greece, with a more particular and detailed account than has yet appeared, of the great Cities of Agrigentum, Syracuse, Delphi, and Nicopolis; the isle of Zante, and the plain of Argos. The second will be confined chiefly to Albania, a country which the author visited under circumstances peculiarly favourable to investigation. Each volume will be adorned with engravings of maps, scenery, plans, &c. for the most beautiful of which the author is indebted to his friend and fellowtraveller, Mr. R. C. COCKERELL. The Cenotaph to the late Princess Charlotte, is finished, with the exception of the figure of the infant, which is to be borne in the arms of one of the Angels which accompany the' spiritual forms of the Princess. The arrangement of this part of the groupe admits of a most interesting display of his likeness and form, whilst it is strongly contrasted by the part beneath where the mortal remains are lain on a bier surrounded by some figures quite enveloped in solemn drapery, expressive of the deep lamentation of people from every quarter of the globe, whilst blind mortals are seen weeping over the earthly remains, celestial beings accompany the pure spirit, which for corruptible has put on incorruption, and for mortal has put on immortality.-The whole will shortly be ready for public inspection, and an engraving will be published of it, by Mr. M. WYATT. A Grammar of the Arabic Language, is preparing for the press; by JAMES GREY JACKSON, professor of Arabic; and late British Consul at Santa Cruz, in South Barbary. No accurate Grammar of the Arabic Language having yet issued from the British Press, an attempt will now be made, to supply in England this deficiency in Oriental Literature. An Account of the Abipones, an Equestrian People in the Interior of South America, translated from the original Latin of MARTIN DOBRIZHOFFER, one of the Ex-Jesuits, two and twenty years a Missionary in Paraguay, is in preparation. The Journals of the Two Expeditions behind the Blue Mountains, and into the Interior of New South Wales, undertaken by order of the British Government in the years 1817-18, by JOHN OXLEY, esq. Surveyor-General of the Territory, and Lieutenant of the Royal Navy, with maps and views of the interior, or newly-discovered country are printing in 4to. Travels in England, Wales and Scotland, in the year 1816; by Dr. SPIKER, Librarian to his Majesty the King of Prussia, have been translated from the German, and will be published in the ensuing month. Mrs. OPIE'S Tales of the Heart will be published in the course of May. LOCHIEL; or, THE FIELD OF CULLODEN, a novel. is in the press. The Final Report of the Commissioners appointed for inquiring into the Mode of Preventing the Forgery of Bank-Notes, "recommended for adoption by the Bank the plan brought forward by MESSRS. APPLEGATH AND COWPER, which was originally submitted to the Directors a short time only before the appointment of this commission, and received immediate encouragement from them; and upon which some improvements have since been made. The directors have readily complied with this recommendation, and the necessary machines are in a state of great forwardness." An ingenious mechanical invention has lately been completed, which opens a new and inexhaustible source of information to those who are afflicted by the privation of sight. It is called a Duplex Typograph, and enables the blind to receive, and communicate ideas by means of letters, upon a principle adapted to the sense of feeling. Thus then has science discovered a new road to minds, from which she has hitherto been almost excluded. The apparatus is compact and portable, and the system so simple and intelligible, that it may be acquired by the blind m a very short space of time, and its application is instantly comprehended by others. The inventor is Mr. J. PURKIS, brother of a well-known musical character, who by the aid of a skilful oculist, obtained the blessings of sight, at the age of thirty, after having been blind from the time of his birth. On the |