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the junctures between the component the masonry proceeded with. The coparts of the entire dam, or of each sepalumn being completed, the parts of the rate portion of it, may be made water dam may, by unscrewing, or other means, tight, previously to its being put in its be detached from each other, so that they place; and in such manner as that, with may be removed without impediment the exceptions to be specified, it may be from the column within. The cutting made to serve again for a similar purpose edge of iron may also be detached and without separation of its component left in the ground if thought requisite; or parts. The lower part of the dam is to it may, together with the cylinder, be be formed in such a manner as best to pe- raised up out of the ground by means of netrate the ground on which it is placed, screws, or other mechanical powers. and to a depth sufficient to prevent the The parts may then be floated to a convepassage of water under it. Sometimes nient place for reconnecting them, and this under part is so formed as to be rea. for adding a new cutting edge if the first dily separated from the upper part, for has been left in the ground. the purpose of leaving it in the ground It is not necessary to proceed through to protect the foundation of the work. the other cases, which are but variations The dam itself is to be forced into the of the same principle; but it is observed, ground by the application of weight, that an embanking wall may be carried either with or without percussion, as the on under the protection of a double dam case may require. When the dam has in the following manner : the outer side answered its purpose in one case it may of the dam being formed double, and cne be removed and made use of in another, end being joined on to the part of the the lower part having been left behind, wall already built, the other end may be or not, as circumstances may render it joined water-tight against the shore, necessary.

either completely by a portion of a dou. Several distinct cases are given in this ble dam, or in part by such a double specification. The first is, when the dam, and the remaining part in the usual space from which the water is to be ex- manner; or, if the distance be small, the cluded is circular, the damn should also he whole of this end may be formed in the circular, exceeding in size the intended usual manner. “For the purpose of ex. column of masonry, as much as will allow cluding the water from so extensive a sufficient space for the workmen. The space as would be required for the formadam is to be formed of wooden staves, tion of a dock, or a great length of pier, nine inches thick at the bottom, and ca. &c. then any such line of dam might be pering to three inches at the top, con- formed by any number of such floating nected on the inside by rings of cast-iron, dams set one end to the other lengthand so fastened as to admit of the dam wise, taking care in all cases, when being separated into two parts, so as to shoring for this purpose would be inconallow of its being taken away when the venient, to make the bottom or base on work is completed. To the lower end is which such double dam is to stand of suí. fised a ring of cast-iron about two feetficient breadth to enable it to resist the deep, one inch thick at the top, and as pressure of the exterior water. The thin as it can be well cast at the bottom, dams themselves inight be made of wood, but strengthened with brackets three feet or of iron, cast or wrought, or of any asunder. This dam is calculated to float other suitable material; and the double about seven feet out of water, that it inay dam, being hollow like vessels, may be the more easily be brought over the spot made use of as receptacles for materials, where it is to be set on the ground. Be- the erection of a steam engine, lodgings ing adjusted as to its exact situation, plat. for workinen, or any other purposes forms may be laid upon the interior subservient to the carrying on of the rings, and weights laid upon them, whe, work. ther of the materials to be used for the "For the purpose," says the patentee, column, or any other description, of “of enabling the juncture between the weights, so as to press the cutting edge several partions of dams set up separately of the cylinder into the ground; and, when to be more easily made water-tight, when the ecge shall have penetrated sufficient in their places, I prepare, when the exact ly to have become water-tight in the line of juncture can be previously ascere ground, the interior water may be tained, a groove in both surfaces of the pumped out, the ground prepared in any dams that are to meet; otherwise in olie manner that may be thought proper, and of them, continuing the groove down to

the

the lower edge of the cast-iron, or other give the respective and required velocipenetrating part of the dam, into which ties, the cylinders may be of equal diagroove so prepared either a tongue of meter and the toothed wheels unequal, wood may be inserted in the manner or the cylinders unequal and the toothed which has been practised in regard to wheels, observing that the nearer the diacoffer-dains, or jo some cases with bet. meters and velocities of the cylinders are ter effect some elastic or plastic matter, to each other, the greater will be the such as oakum, moss, cut straw, with or power of the machine, and the slower without a mixture of earthy matter, may will the weights be raised or lowered, be rammed down from the top to their Observations of the Patentee. The ado very lowest edge.

vantage that will result from this in

proveinent is principally safety; from the HR. WILLIAM HARDCASTLE's, (ABING- present constructed cianes, and partica

DON, BERKS,) for Improved Cranes to larly those with walking wheels, the numprevent Accidents from the Goods at- ber of persons killed or maimed almost taclied to the Pulley overpowering the exceed credibility. Indeed, accidents Person at the Winch, or in the IValk from the working of cranes have hitherto ing Wheel.

been considered so much a matter of This improvement consists in causing course, that one might conclude all practhe rope or chain employed in raising or ticable means of prevention had been Jowering the weights to wind upon two tried without effect; for, notwithstanding cylinders of different diameters, or to the great mechanical improveinents recylinders of the same diameter, turning cently made in almost every kind of mawith different degrees of velocity, but chinery, the present patentee is the first contrariwise, the rope or chain winding that has undertaken to construct cranes on one cylinder, at the same time it une on a principle chat will prevent the recure winds from the other, so that a weight rence of those accidents; and he appears hanging by a pulley from the middle or fully persuaded that a few ininutes ab bite of the rope or chain is raised or low- tention to his specification will convince ered by the turning of those cylinders; any person that, by adopting his imfor it is evident that the larger cylinder, provement, all liability of accidents will or that moving with the greater velocity, be removed, insomuch, that a stranger, will take the rope or chain faster than the who had never before seen a crane, miglic smaller cylinder, or that moving with be entrusted with the raising or lowerthe lesser velocity; and, since the two ing goods with the same salety as the ends of the rope or chain fastened to most experienced workman; another adeach cylinder tend to turn them in oppo- vantage attending it is, that one person site directions, and each sustains an equal is competent to lower any weight, howweight, they counteract each other and ever great; for, though ihe weight can. balance the weight, which consequently not run down of itselt, it will require very cannot run down of itself; and thereby little power to turn the winch or walking the utmost safety is obtained in raising wheel in order to lower it; any of the or lowering it. One of the cylinders may present constructed cranes may, at a be turned by hand with a winch, or by small expense, be altered w work on the a walking or raising wheel, or by any principle of the patent. other mode of applying power; the other A model may be inspected at No. 90, cylinder is to be turned from the first by Blackınan-street, Southwark. toothed wheels on the axis of each; to

VARIETIES, LITERARY AND PHILOSOPHICAL.

Including Notices of Works in Hand, Domestic and Foreign. * Authentic Communications for this Article will always be thankfully received.

M R . Walter Scott, one of the most this new production. In order to

IV successful poets of this age, has judge by comparison, it should be jont finished, and will speedily publish, recollected that Milton obtained, three a poein, in six cantos, under the title of times five pounds for his Paradise Lost; RÜSEBY. The public opinion of the Johnson 15001. for his Dictionary; and mnuse of Mr. Scott may be inferred from Darwin 6001. for his Botanic Garden. that of his publishers, who have agreed In addition to his new Elements of to give him Uhree thousand guineas for General Cheinistry, SIR IIUMPHREY

DAVY

Davy has undertaken another work on vember, and to be continued on each the Elements of Agricultural Chemistry, succeeding Tuesday, Mr.J. Mason GOOD, being copies of those Lectures which he on the Philosophy of Physics, to comdelivered with so much applause before mence on Friday, the 20th of November, the Board of Agriculture.

to be continued on each succeeding FriMessrs. SHEPHERD (of Gataker) and day. And Dr. CROTCII, on Music, LO JOYCE (of Highgate) announce, in two commence early in 1813. volumes, an Introduction to a Systeniatic Mr. FIDDLER, a captain in the HudEducation in the various Departments son's Bay service, has communicated to of Literature and Science, with rules Mr. Arrowsmith, the draught of the dis. for studying each, and references to ap- trict of country which lies between the proved authors.

rocky mountains and the great ocean, Mr. OLDFIELD will publish early in and between tbe latitude 52 and 46. November, a complete Ilistory of the It contains all the head waters of the House of Commons and Boroughs of the Columbian River, a lake called, by Mr. United Kingdom, froin the earliest Pe- Fiddler, Lean's Lake, a river running into riod to the present Time, in four octavo it called Arrowsmith's River, and a river volumes,

of magnitude called Wedderburn's River. Two volumes of the Sermons of the The whole tract is inhabited by tribes of late DEAN KIRWAN are announced, Aat-head Indians, and one large extent is with an Account of bis Life. Is it not filled with wild horses. Mr. Arrowsmith an opprobrium on the Irish nation, that purposes to introduce these discoveries no applications of the Editor of the into his General Map of North American Monihly Magazine, nor any stimulus of Discoveries. public spirit, have yet led to the public Mr. ARROWSMITU has just completed cation of Memoirs of the two Kirwans, a new Map of Germany, in six sheets of Mr. J. C. Walker, and of General of double elephant, being the largest Vallancy, four departed ornaments of map of that empire ever drawn and publiterature and science, and four sons of lished in England. Like all the maps af which Erin ought to be proud; but this eminent geographer, this new one whom Irishinen have suffered to sink is derived either from original or uninto the grave without a tributary line questionable and superior sources. " either in verse or prose?

The same Geographer has for some In like manner is it not a libel on the vears been engaged on a Map of Eng public spirit of the English literati, that land and Wales, in eighteen sheets, the first account of the life and disco. which, when put together, will be tea veries of our own Cavendish has just feet by twelve.. Of this extraordinary been read by Chaptal, at a sitting of the map it deserves to be noticed that, it National lustitute of France?

will contain at least a million of names, Mr. SOUTHEY announces two volumes which is the more remarkable because of prose Miscellanies, under the title of the places enumerated in the Population OMNIANA.

Return, are only 15,741; and Capper's At St. George's Hospital and George- Topographical Dictionary does not constreet, Hanover-square, a course of Lec. tain above 20,000 places for the three tures will recommence on Monday, Oc- kingdoms, although double the number tober 5, on physic and chemistry, by contained in Luckombe's Gazetteer. George PEARSON, M.D.F.R.S. &c. &c. Mr. THOMAS THORNTON announces a

The Rev. S. Barrow, author of the new edition of the Works of Otway, in Young Christian's Library, &c, will pub- three volumes, Jish, in a few days, a volume of Sermons The rapid and successful extension of for Schools. It will comprise one for Bible Societies through the kingdom, is every Sunday in the year ; besides one a feature of the age highly honorable, for Christmas Day, Good Friday, Easter particularly at a time when the Ani. Sunday, and Fast Day; the whole se- Christian spirit of Warsare is so predolected and abridged from Horne, Blair, minant. Let us hope, however, that the Seed, Gisborne, Enfield, Zollikoffer, former spirit is an indication of an abatePaley, Jortin, Porteus, &c. &c. ment of the latter; and that the Christian

The following arrangeinents have been spirit of pcace will soon be as widely made for lectures, at the Surry In- spread as the sacred voluine which incul. stitution, in the ensuing season: Nr. cates it. Among the Auxiliary Bible COLERIDGE on the Belles Lettres to Societies, our attention has recently been com mince on Tuesday, the 3d of No. called to that for the City of LONDON, at

the

the bead of which is the Lord Mayor; stone was to common lawyers. Each of and that for WILTSHIRE, under the sanc- them simplified a complicated science; tion of the Bishop of Salisbury.

each of them analysed, and reduced to We always record with pleasure, im. elementary principles, a mixture of heprovements in the typographic art. At terogeneous particulars, but a continued this moment it is our duty to mention succession of new statutes, enacted for one made by Mr. THOMAS MOTTLEY, of the purpose of meeting new evils, not less Bristol, pafticularly useful for cutting than various new interpretations of old large letters, and any kind of peculiar ones, have not only rendered repeated types in copper, called copper-plate editions of these Treatises necessary, but printing types. The principle is like have invited the investigations of addi. wise extended to the large letters used tional writers; till it is become a matter for signs, for which purposes the letters of doubt, whether the actual execution may be cut either in copper or iron. of a magistrate's duty, or the fatigue of The inventor's London agent is Mr. learning it through the medium of such W. Jenner, of Forster Lane.

voluminous instructions, be the more The second volume of the Pulpit, by irksome task. To supply this defect, Onesimus, will be published in the course and at the same time to produce a work of the ensuing month; comprising. Crie of practicable reference, and to condense, ticisms on Thirty-six Preachers, and into the smallest intelligible compass, Nemoirs of the late Rev. Tho. Spencer. the voluminous information already in

The report of a Tourist among the use, has therefore been the leading purbooksellers of Great Britain, enables us pose of Mr. Dickinson's new produce to state that the increasing passion for tion, literature operates in regard to the sale Miss Graname is printing a Journal of books, as a counterpoise to the general of her late Residence in India, accomdearth of trade; and that; among book. panied by illustrative engravings. sellers, there have been fewer failures Mr. TABART, of Clifford-street, who and less distress than in most other had the merit of opening the first juvebranches of our home trade. We pube nile library, a species of establishment lish this fact with exultation, not that which has since had many initators, is we think any class of British society is, printing a revised and ornamented edte at this time, to be envied, but because tion of Barbauld's and Trimmer's Less it is encouraging to our views of the ge- sons. neral progress of literature.

The Rev. David Blair, whose name Mr. ADAIR, author of Questions on is a passport into all seminaries, has just Goldsmith's History of England, bas completed a Parent's Catechism of the in the press, a similar collection of Ques. First Dawnings of Knowledge ; including, tions on Murray's Grammar, and Irving's among other appropriate ornaments, a Elements of Composition.

clock-face, with moveable dials, for A small impression is reprinting of teaching children the art of learning the that extremely scarce book entitled, A hour. Spiritual and most Preciouse Perle, Proposals, with annexed specimens, teach ynge all Men to love and imbrace are at this time issuing gratis by the the Crosse, as a most swete aud neces- booksellers in town and country, for a sarye Thynge, with Preface, &c. by subscription work intitled, Shakespeare Edwarde, Duke of Somerset, Uncle to set Free, or the Language of the Poec kinge Edward VI.

asserted; being a full but dispassionate Dr. WALKER's long promised Gram- examen of the readings and interpretamar of Medicine, for the use of medical tions of the later editors. The whole students and pupils, is at length finished comprised in a series of notes sixteen and will be published in a few days. hundred in number, and further illusa

Mr. DICKINSON, formerly an emi. trative of the more difficult passages in nent banker of Newark, and thirty years his plays, to the various edilions of which an acting and respected magistrate for this publication will form a complete and the counties of Nottingham and Lincoln, necessary supplement, has in the press, and will speedily pub- Dr. ADAM'S Autunnal Course of Lec. lish, a Practical Exposition of the Law tures on the Institutes and Practice of relative to the Office and Duties of a Medicine, will commence on Thursday, Justice of the Peace, continued to the the 8th October, at his house, Hatton end of Trinity Term 52 George III. Garden, Barn was formerly to justices what Black Proposals have been issued for pub.

lishing

Eshing by subscription, in ten Numbers, oxygen is absorbed, and carbon disenforming one volume, Specimens of the gaged in the process, as when the animal Architectural Antiquities of Norfolk; was living; and he hence inferred, that the containing sixty highly-finished Etchings, action of the brain and nerves, is necesrepresenting exterior and interior Views sary to the production of animal heat. of the most celebrated Remains of An- A Child under eight years of age has tiquity in the County; accompanied with lately been exhibited at Spring Gardens, suitable Descriptions; by JOHN SELL possessed of wonderful powers for perCOIMAN.

forming arithmetical operations. His An edition of the late Mrs. Cowley's name is ZERAH COLBURN, and he was works, in thiee oclavo volumes, is in a born at Cabut, in Vermont, in the Unistate of forwardness.

ted States of America, on the 1st of SepA new work will appear in October, teinber, 1804. About two years ago, upon the Prophecies, entitled “ England being at that time not six years of age, Safe and Triumphant;" by the Rev. he first began to show his wonderful Frederic TILRUSTON, M.A.

powers of calculation. His father, who had A posthumous work will speedily ap- 'not given hiin any other instruction than pear, by Mr. William Davis, late edi- such as is to be obtained at a small daybor of the Gentleman's Mathematical school, was surprised one day to lear Companion, entitled Familiar and Com. him repeating the products of several plete Treatise of Land Surveying, by numbers. The news of this infant prothe chain cross and offset staffs, in four digy soon circulated through the neighparts; to wbich is added a Supplement, bourhood, and the father was encouraged containing the inethods by the plane to undertake the tour of the United table and theodolite, with directions for States, and finally to visit London, where conducting subterraneous surveys. they arrived on the 12th of May last.

Sabrina island has gradually disap. He determines, with the greatest facility peared since the month of October, and dispatch, the exact number of mi1811, leaving an extensive shoal. Sinoké nutes or seconds in any given period of was discovered still issuing out of the sea, time. He tells the exact product ari. in February, 1812, near the spot where sing from the multiplication of any numthis wonderful phenomenon appeared. bers, consisting of two, three, or four,

The Carmarthen, on a late voyage figures ; or, any number, consisting of from Port Louis io Bombay, in the early six or seven places of figures, being propart of the monsoon, passing to the posed, he will determine, with expesouthward of the Sychelles, fell in with dition and ease, all the factors of which a small low Island, which is not laid down it is composed. This singular faculty in any chart or book. It runs from consequently extends to the raising of north-east to south-west, is about six or powers, and to the extraction of the seven miles long, and one or two broad, square and cube roots of the number prolat. 7° 7south, long. 53° 5' east. posed; and likewise to the means of

It is a fact most disgraceful to the Le. determining whether it be a prime numgislature, the age, and the nation, that ber. At a meeting of friends, this child the Schedule to the new Medicine Act raised the number 8 progressively to the contains the vames and titles of between sixteenth power, and, in naming the last FIVE and six HUNDRED QUACK MEDI- result, 281,474,976,710,656, he was CINES! The principal object of the bill righe in every figure. He was asked the was, however, to render liable to the square root of 106929, and, before the STAMP DUTY and REVENUE Laws, "All number could be written downı, he an. artificial mineral waters, and all waters swered $27. Ile was then required to impregnated with soda, mineral alkali, name the cube root of 266,336,125, and or carbonic acid gas.

with equal facility and promptness reMr. BRODIE has read a paper on ani. plied 645. One of the party requested mal heat, to the Royal Socieiy, tending him to name the factors which produced to confirm some of his remarks on this the number 247 183, which be immesubject in his former cominunications. diately did by mentioning the two huin. He animadverted on the inadequacy of bers 941 and 263; which indeed are the Black's Theory, and the inaccuracy of only two numbers that will produce it. Crawford's experiments; showed that, by Another of them proposed 171395, and artificial respiration, animal bodies des he named the following factors as the prived of the brain cool faster than when only ones that would produce it, viz. left alone, although an equal portion of 5X34279, 7 X 24485, 59 X 2905, 83 X

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