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PATENTS LATELY ENROLLED.

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Communications of Specifications and Accounts of New Patents, are earnestly

solicited, und will always commund early notice. UR. THOMAS POTT's, (HACKNEY), for a may be made as long again, and the ma.

new Process of Freeing Tarred Rope cbine increased to double the size ; by from Tur, and of rendering it of Use which means about four times that num. to the Munufacturer.

ber of bricks may be produced in about THE process made use of for freeing the same time, and so in proportion to

tarred rope froin tar, may be con- the first mover, the product of the maducted in three different ways : first, by chine will be more or less. The mode : means of sulphate of alumine (cornmon of making tiles is described with preciallum); secondly, by sulphate of alumine sion, and it appears that the operation and fullers-earth; and thirdly, by tullers- in all instances depends upon what is deearth alone. When sulphate of alumine nominated a mouth piece, which is is used, the rope is to be cut into proper screwed to the box by a flanch, having lengths and opened, and boiled in water, in it suitable openings or orifices therein. in which is mixed five pounds of sulphate Thus there are different mouth-pieces of alumine, to every cwt. of rope. When for making mouldings to ornament build. boiled an hour it is to be taken out and ings, and channels to convey water; and beaten, and ihe operation repeated. it is plain that whatever shape the hole The rope is next to be boiled with a car- is made into, the same furma will be ob. bonate of lime, wbiting is toe most pro- tained by the clay pressed throngh it,

It is then to be cleaned and which is received on bandages over rolbleached either on the grass or with oxylers, to the length required, aird then muriatic acid. The operations are some. cut off even at each end by the separator. what similar when fullers-earth is used, Tubes and pipes are made in round or or fullers.earth with alum; but the pro- square boxes, or receptacles of wood or portions of the materiais differ; for an cast iron. The piston should fit nearly account of which the reader is referred tight, and be supported, or side-steadied, to the specification,

when lified above the round or square

box or receptacle, in order that it may MP.JOHANN GEORGE DEYERLEIN'S,(LONG be filled. Tubes of all kinds and deo

ACRF), for « Machine, new Principle, scriptions, whatever be their shape, may
or Method of making Bricks und Tiles, be thus readily made.
and other Kinds of Pottery.

The inachine consists of a box or other MR. PETER STUART's, (TLEET-STREET),
receptacle into which the clay is put, for a new Method of Engraving and
and also a plug, or forcing instrument, Printing Maps, 8c.
by means of which the said clay is forced This method is for the purpose of com-
onwards during the work, so as to urge bining the arts of engraving and lettere
the same through one or more suitable press printing, so as to produce dispatch
openings or oritices, which give the figure and economy of the latter, with the ef-
or form; and also certain mill-work for fect of general utility. The printing
giving motion and effect to the plug or maps, figures, &c. for books, magazines,
forcing instrument, and also a fit car. newspapers, &c. consists, in the first
riage for receiving and conveying away place, in reversing the ordinary or com-
the bricks or other products of art; and mon way of printing or representing such
if need be another carriage for supporting figure or figures; that is to say, where
and conveying the combined or united the usual mode of printing or engraving
parts during the tiine of working, or from the figures now described has hitherto
place to place. The use and applica. been by a black upon a white ground or
zion of the machinery are shewn in surface, the new method is by intro.
drawings attached to the specification, ducing the contrary effect, viz. by a
and the necessary explanations given in white upon a black ground or surface.
it. By these it appears that by what In other words, as the usual way of
the patentee calls “ every home and out printing or representing in maps, for
stroke of this machine, fifty-six bricks instance, the rivers, towns, fortifications,
will be finished; or if the power of the letters, or words, &c. &c. has been by
first mover is increased either by addio black upon white, the new method is
tional men or otherwise, the barrow by producing a contrary effect, by leaving

the

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the tints, lines, or figures, alluded to, as smooth as possible, as in copper-plate white instead of black; so that where engravings, ought to be made sufficiently in the common way the paper is covered rough, either by mechanical or chemical with black or coloured ink, the new me- means, so as to make the ink, applied by thod is to leave it uncovered, and rice the letter-press printer's balls, adhere in versa : or instead of producing dark a way nearly equal, or in such quantity figures on a light ground, to produce or proportion as is wanted or intended. light figures on a dark ground or surface, The last preparatory process of the plate or on a ground darker at least than the for the letter-press, previously to its being figures themselves. In the second place, printed as described, is by fixing it on a instead of representing all figures by wooden block; or by grooving it on a black tints or lines, or black figures, as brass or other metallic standard; or by now commonly represented on a white fixing it on a clay or earthen substance ground or surface. Mr. S. can adopt or cement; taking care that the whole any other coloured ground or surface, body thus formed shall not be higher or taking care always to produce the advan. lower than the types commonly used at tageous combinations of the two arts of the letter-press; and also taking care, engraving and letter-press printing, that that it be calculated in every degree to is to say, the dispatch and economy of be embodied as it were with the lettere the latter with the effect and general press printer's form or types, so as to utility of the former, “ a combination," produce, by the very same operation of says he, “ hitherto wislied for in vain, the letter-press, the impression of both and from which, it may be obvious, very the plate and the types at one and the essential results will arise both to the same time, or by one and the same pull artists and to traders in the arts, and, in of the letter-press printer, and on the fact, to the public, that will no doubt very same sheet or piece of paper. Or be actuated by interest to encourage a the plate or plates thus prepared, may, view invention, which may aiford an ex- if on particular occasions deemed more traordinary gratification by a specdier expedient, be worked off alone at the mode of intelligence, through a cheaper letter-press, so as to produce the inmedium."

tended effect of engraving with the faciThe engravings of the figures may be lity and dispatch of multiplying copies cut or stainped on plates of brass, cop- agreeally to the nature or principle of per, tin, pewter, type-metal, or wood, operation peculiar to ihe letter-press. or any other substance on which engrav- “Thus by the means now described or ings can be made; and, for the better specified," says Mr. Stuart, “ I combine, adapting the ground or surface of the or unite, for maps, charts, music, anatoplate, or for the better rendering the mical figures, or any figures or repre. ground or surface fit in all its parts for sentations of the human body, or for all the proper reception and adhesion of or any of the other figures already mens that kind of ink used by letter-press tioned, performed in my manner, printers, so as to produce a clear and parate arts of the copper-plate engraver an equal impression on all its parts at and the letter-press printer, by engraving once, he causes dots or lines to be cut, as engravers usually do, and by printing marked, or stamped, or drawn across the as printers usually do; thereby renderground or surface of the metallic plates, ing, by the application of these united or other substance; or corrodes it witli arts in tbe printing of books, magazines, aquafortis, so as to produce a sufficient pewspapers, periodical publications which degree of roughness for the adhesion of require dispatch, a very great saving or the particular ink now mentioned; abridgment of time, labour, and expence, leaving the figures or subject of the plate in the exercise of both aris, and conse. or engraving, untouched by such dots or quently a very great convenience and lines. The part of the surface which is advantage to the public at large." not engraved upon, instead of being made

the sea

NEW NEW PUBLICATIONS IN MAY.

AGRICULTURE

MEDICINE

DRAMA.

EDUCATION.

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MISCELLANEOUS.

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As the List of New Publications, contained in the Blonthly ilagazine, is the ONLY COMPLETE LIST PUBLISNED, and consequently the only one that can be useful

to the Public for Purposes of general Reference, it is sequested that Authors and Publishers will continue to communicate Notices of their l'orks

, (Post paid,) and they will always be faithfully inserted, FREE of EXPENSE.

Parliament, upon the Bills for abolishing the TREATISE on Rural Affairs, illustrated Punishment of Death for Stealing to the

with various places of Husbandry imple- Amount of Forty Shillings in a Dwelling. ments. By Robert Brown, farmer at Mar. House ; for Stealing to the amount of rive kle. 2 vols. 8vo. 11, 5s.

Shillings privately in a Shop folid for Stealing ARTS, TINE.

on Navigable Rivers,

With the Debatos og British Gallery of Engravings. No. VII. the Erection of Penitentiary. Houses. By super royal folio 21. 2s.

Basil Montagu, esq. 58.
Memorandum of the Earl of Elegin's pur-
suits in Greece. 6s.

Communications relative to the Datura
The Gazette Extraordinary, a Comedy in Cure of Asthma.

Stramonium, or Thorn Apple; as a relief or

Addressed to the editor of five acts. By Mr. Holman, 2s. 6d. The Dramatic Works of Ben Jonson and before published. With a coloured engraving

the Monthly Magazine. Many of them never Beaumont and Fletcher; the first printed from of the Plant. 36.6d. the text and with the notes of Peter Whalley ;

The Medical Monitor. 'By E. Senate, the latter from the text and with the notes

M.D. Part. I. 45. of George Colman, esq. 4 vols. royal 8vo.

Surgical Observations on Tumours and Gl. or 4to. 71.

Lumbar Abscesses. By John Abernethy, Prince Dorus; or, Flattery put out of assistant-surgeon to St. Bartholomew's HosCountenance. 2;. 6d. with coloured engra.

pital. 8vo. 68. yings 5s.

Beauty and the Beast; or, a Rough Out. Racing Calendar for 1810. By W. side, with a Gentle Heart. 25. 63. with co

Pick. 7s. luared engravings 5s.

A Cockney's Adventures during a ramble HISTORY

into the country. By Joseph W. Coyte. Introduction to the History of the Revolu. 1s. 64. tion of Spain. By Alvaro Florez Estrada,

An Essay on Human Consciousness: cons attorney-general of the province of Asturias. taining an Original View of the Operations Translated from the author's manuscripts, by of Mind, Sensual and Intellectual. By Joha. William Burdun. 5s.

Fearn. In one vol. 410. 11, 11s. 61. boards. Hunter's History of London and its Envi. The Polis for the Election of Chancellor tons. Parts VIII. IX. and X 10s. 63. each of the University of Cambridge, on Tuesday, to subscribers, 11. is. to non-subscribers. March 26, 1811; and that of Representative

A Chronological Abridgement of the His. in Parliament for the University, on Wednes. tory of Great Britain. By Ant. Fr. Bertrand day, March 27, 1811. By John Beverley, de Moleville, late minister in France, under M.A. 2. the reign of Louis XVI. Volo. I. and. II. The Protean Figure, er Metamorphic Cose 11. 45.

tumes. 11. 18.

The Maltsrer's Guide, containing the Sube A Practical Treatise on Pleading in As. stance of the several Excise Laws and Regusumpsit. By Edward Lawea, esq. of the lations to which Ma'sirls are subject. 6s. Inner Temple, barrister of law, royal 8vo.

Strictures on Couris of Request, vulgarly 11. 115. Gd.

called Courts of Conscience, alias Courts A Dictionary of the Practice in Civil Ac. without Conscience. By J.. H Prince. 1s. tions in the Courts of King's Bench und Essays on Man, delinearing his Intellectual Common Pleas; together with Practical Die and Moral Qualities. By Thomas Finchi sections and Forms, distinctly arranged under

12 mo. 6s. each head. By Thomas Lec, of Gray's Inn.

The Elinburgh Encyclopedia. Conducted. 31. 18. boards.

by David Brewster, L.L.D. F.R.S. Edin. The Speech of W. Frankland, esq. in the Parts III. and IV. 186. House of Commons, on the several Bills for making alterations in the Criminal Law. 38. Memoirs of the Wernerion Natural History

Duults upon the reasoring of Dr. Paley, Society, for 1603, 9, and 10. 8vo. 11. 1s. relative to, an Observations on, the Criminal

NOVELS, TALES.
Law. By R. G. Arrowsmith. 4s.

Gotha, or Memoirs of the Wurtzburg Fa.
The Pedates during the last Session of mily. 3 yols. 188.

La

LAW.

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NATURAL HISTORY.

POETRY.

THEOLOGY.

La Prise de Jericho. Par Mad. Cottin. Resumption of Cash. Payments by the Bank 2s. 6d.

of England. By J. L. Towers.

Observacions on the Present State of this Nobility; in imitation of the Eighth Satire Currency of the Bank of England. By the of Juvenal. 410. 4s.

Earl of Rosse. 35. 6d. Poems on Several Occasions; consisting of Further Observations on Bullion and Bank Sornets, Miscellaneous Picces, Prologues and 'Notes; with Remarks on some of the late Epilogues, Tales, Imitations, &c. By Jolin Periodical and other Publications on the Taylor, esq. foolscap 8vo. 6s.

same subject. By John Tbeodore Koster, The Poctical Works of Oliver Goldsmith, esq. 2s. with remarks, attempting to ascertain, from Reply to Mr. Bosanquet's Practical Obser. local ovservation, the actual scene of The vations on the Report of the Bullion Com. Deserted Village, embellished with seven mittee. By David Ricardo. 8vo. 45. Silustrious er ings by Me. Alken, from A Short Investigation into the Subject sf drawings ta ton upon the spot. By the Rev. the alledged superfluous issue of Bank Notes, *. H. Newell, B.D. Fellow of St. John's the High Price of Bullion, and the unfavore College, Cambridge. 4to. 11. 1s.

able State of Foreign Exchanges. 15. The Campaign in Egypt. A Poem in- Farther Observations on the Subject of the tended to celebrate the valour of the british supposed Depreciation of the Currency and Military and Naval Forces employed in the the Causes of the Diminution of the Va. Expedition to Egypt. By Constantine Wil. lue of Money. 'By Robert Wilson, esq. liams. 8vo. 105. od.

8vo. 2s. Poetical Pastimes. By James Fitzgerald." Svo. 7s.

Redemption; or, a View of the Rise and The Beauties of Carlo Maria Maggi Progress of the Christian Religion, from the paraphrased. By Marianna Starke. 43. 60. Fall of Adam to its complete Establishment POLITICS AND POLITICAL ICONOMY. under Constantine. By the Rev. Montagu

Sur La Banque de France ; les causes de la Pennington, M.A. vicar of Northbourn, in Crise qu'elle à éprouvée les tristes effets qui Kent. 8vo. 75. 6d. en sontresultés, et les moyens d'en prevenir Christian Researches in Asia; with Notices le retour, avec une Theorie des Banques Rap- of the Translation of the Scriptures into the port, fait et ce Chambre de Commerce par Oriental Languages. By the Rev. Claudius one Commission Speciale. Recommended to Buchanan, D.D. late Vice-Provost of the the perusal

those who take an interest in College of Fort William in Bengal, 8vo. 75. the Bullion Question. 4s.

royal paper 10s. Proposals, with the Mersures and Plans

The Nature and Perpetuity of the Influence detailed, for Rectifying Public Affairs and of the Holy Spirit; a Sermon delivered at a Private Grievances, and instituting the Happy Monthly Association of Congregational Miand Divine Order of Things intended for nisters and Churches. By William Benga Mankind; or a Self-evident Practical System Collyer, D.D. 25. of Political, Individual, and Commercial In- The Works of Thomas Secker, L.LD. terests, whereby the greatness and felicity of late Lord Archbishop of Canterbury. With the British Empire may be consummated at his Life, by the late Bishop Porteus, 6 vols. present, and rendered permanently secure. 8vo. 31. 3s. By George Edwards, esq. M D. author of the Sermons on the Person and Office of the Income or Property Tax. 2 vols. 8vo. Redeemer, and on the Faith and Practice of 11. 118.

the Redeemed. By William Jesse, A.M. A Letter Addressed to his Royal Highness 8vo. 88. the Prince Regent, on West India Affairs, Sermons, by Thomas Lauris, D.D. mi. by a British Planter. 2s. 6d.

nister of Newburn. 8vo. 10s. 61. Naval Economy, exemplifier! in Conversa. A Sermon preached at Whitechapel, on tions hetween a Alember of Parliament and

Sunday, Feb. 10, 1811, for the benefit of the the Officers of a Man of War, during a Win. Charity Schools in that parish, conducted oa ter's Cruise. Ss.

the systein of Dr. Bell. By the Rev. T. G. The British Constitution, analized by a Taylor, vicar of Dedham, Esses. 1s. 6d. or Xeference to its History; by a Summary or 15s. per dozen. Detail of its most Salutary Laws; and by a A'Plain Statement of some of the impor. Sketch of the Government of Great Britain, tant Principles of Religion, as a preservative as a Monarchy, Peerage, and Democracy; against Infidelity, Enthusiasm, and Inmo. with their conjoint or separate Perogatives and rality. By the Rer. Thomas Watson. Privileges. 2 vols. 12mo. 16s.

8vo. os. An boqniry into the Present State of the Certain Principles in Evanson's Dissonance Litiuence of the Crown, and the Expediency of the Four Evangelits, &c. examined in of a t'aidiamentary Reform. By John Ranbyo Eight Discourses delivered before the Unie esqs. 60.

versity of Oxford, at the Bampton Lectures, Tac Expcdicney and Practicability of the in iviu. Zve, 10s. d.

TOPOGRAPAT.

TOPOGRAPHY.

lusia, Granada, Murcia, Valencia, and Cata. Notices respecting Jamaica, in 1808, 9, and lonia, up to Montserrat, and also in Ma. 10. By Gilbert Mathison, esq. 55.

jorca and Minorca, during the year 1609. An Account of the past and present State By Sir John Carr. 4to. 21. 25. of the Isle of Man. 8vo. 10s. 60.

A General History and Collection of

Voyages and Travels. By kobert Kerr, Travels in the Spanish Provinces of Anda. F.R.S. F.A.S. Edin. Part III. 6s.

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VOYAGES AND TRAVELS.

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ROYAL INSTITUTION. parted with some of its

oxygen FE

EW discoveries in modern times quired a portion of water, it ba poun

have so powerfully excited the ato properties of potass. Aminonia ha reas tention of the scientific world, as that of been procured as a metallic armies the metallic nature of potass, soda, and united with mercury, or sodium. The amumonia; though this discovery has not manner of procuring it is, hy placing a bitherto been atterided with any benefi- globule of mercury in a small cavity, cial practical application. It can bow- made in a piece of muriat of ainincuia, ever scarcely be doubted, that a more (sal ammonia) one wire from a collaié perfect acquaintance with the nature of battery is connected with the mercury, metallic bodies, must be followed by in- the other with the muriat of aminonia: proved processes in the inodes of smelt- the globe of mercury is increased in size, ing the pres, and in the various arts of loses its fluidity, and becomes a solid memetallurgy. Potassium, or the metal of tallic amalgamn. potass, bas lately been procured in larger The discovery of the metallic nature of quantities, by heating iron fileings and the alkalics, potass, and ammuia, has potass together in a gun barrel, or iron been followed by the discover, that all retort coated with clay. The colour of the earths are also metals united with potassium resembles that of tin, it is ea. oxygen. These earths are "silex, clay, sily cut with a knife, and solders with it. lime, magnesia, barytes, strontian, and self at the common temperature of the the newly discovered earths, zucon, uria, átmosphere. Its most remarkable quali- and glucine. ties are its levity and combustibility. It Lavoisier in his elements states his is considerably lighter than water; if the opinion that barytes, and some if not all weight of a given quantity of water were the earths were metallic oxyds, but this 10 oz. that of the same quantity of pot- opinion was not supported by any proof; assium would be only 1 oz. it is the and the experiments of Toudi, who aslightest known solid substance. When it serted that he had procured globes of comes in contact with water, it iinme- metal froin barytes, lime, and inagnesia, diately inflames with great violence, de have generally been regarded as incon. composing the water and absorbing its clusive, but perhaps they have not been oxygen. It will burn with intense heat properly investigated. * By means of the and vivid light under the surface of wa- Voltaic battery, Dr. Davy procured very ter, and will probably be found the most small globules of metal from all the powerful agent in destructive naval war- earths, but they explode almost iinme. fare, that has ever been employed. The diately afier their formation, and absorb properties of sodium are nearly similar to oxygon from the water, which is used to those of potassium; except that when make the earths into a paste to be acted pure it does not infiame with water, but upon by the Voltaic battery in these exinoves in a rapid manner along its sur- periments. Potassium, or the metal from face, decomposing it, and absorbing the potass, has the strongest affinity for oxyoxygen. Potass, or the vegetable alkali, gen of all known substances; when it is in the purest state in which it is obtained combined with the earths, and acted by chemical means, retains 17 per cwt. upon by the Voltaic baitery, a larger of water, even after being kept in a red globe of metal may be obtained froin heat for several hours; it is properly an then. The attempt to decompose the hydralt of potass. When potassium is earths by ignition with iron and charcoal Lurned in oxygen gas, it forms a sulistance containing more oxygen than pot- * Vide Mr. Kere's nose in the 3d edition ass, and is free from water; it is hard of his Translation of Lavoisier's Elements, P. aud most iufusible; but when it has 29%.

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