densers might be applied to one boiler, or two or more boilers may be applied to one or more condensers. The cooler or condenser might be another pan not heated, but for saving of expense, the patentees recommend clay lined with brick-flags, or any other cheap and convenient materials, for forming a shallow pond or reservoir, communicating with the boiler, and acting as such cooler or condenser: any other way of causing an alternate variation of the degrees of heat in the brine, during the process, would produce a similar effect; "but no method," say they, "can be more simple and easy for this purpose, than that which we have described; and this, in its principle, comprehends all other methods of graduating and regulating the beat of the brine, by alternate increase and diminution; and therefore we protest against the evasive employment of any mode different in form and appear ance, whereby the same or the like effect may be produced, either entirely or partially, inasmuch as all such different modes would be in substance and principle, the same as that which we have described; and we particularly notice that, as the communication is to be open, a pan or pans of an enlarged size, having the heat applied only to part thereof, would operate to the forming of the salt, because in that case the parts of the pan not heated, would be in effect condensers to the heated parts of the pan; but the extension of the pans would operate against saving of expense. By the addition of the coolers or condensers, a much greater quantity of salt will be made in the sanie space of time, than can be made in the saine pans or boilers, without the coolers, or coudensers."

MR. CHARLES LE CAAN'S, (LLANELLY,) for an Invention of certain Apparatus to be added to the Axle-trees and Wheels, or Naves of Wheels, of Curriages, so as to impede, resist, or check, their Action.

This invention consists in causing the wheels, or either wheel singly, of any carriage whatsoever to be stopped, or become stationary, at the pleasure of the driver thereof, by means of bolts or slides of iron, or any other metal or compound metal, attached to an axle-tree of any kind or sort, which bolts or slides, by means of levers, with or without the ́assistance of springs, come into contact with a plate of iron, or any other metal, or compound metal, on which one or

more projections are formed; which plate being let in, and fixed to the nave of a wheel, will answer the purpose required, by impeding the motion of any carriage, to the wheel or wheels of which the same is applied. The levers are, or may be, connected with the body of any kind of carriage, and to such part thereof as may prove most convenient, by either chains, strings, cords, leather, or any other substance necessary for the purpose.

MR. JOHN SCHMIDT'S, (ST. MARY AXE,) for a Phantasmagoric Chronometer, or Nocturnal Dial, rendering visible at Night, to any enlarged size, the Dist of a Watch, against the Wall of a Room, &c. &c.

This instrument consists of a vase, or any ornamental case, either of wood, stone, tin, or any other metal applicable, and so constructed as to allow a free communication of the air, yet to prevent the rays of the light from being visible; and having on one side a watch with two dials, or what are called the day and night dial, and on the opposite side a combination of glasses, or a single glass moveable in a tube: the diameter of the glass is one inch and three quarters, and the pins two inches and three-quarters; serving to represent the inward or nightly dial, against the wall. In the foot of the vase is a light or lamp, shut in, yet so constructed, that by means of a little door or slider, it may be taken out, and when in, may be altered in its position, and placed nearer or further off the mag nifier or dial. In the bottom of the vase is a case, to receive the waste oil of the lamp. Having stated at large the par. ticulars of the nocturnal dial, the pa tentee goes on to describe the mysterious circulation, or chronological equilibrium; which apparatus may be applied instead of the watch-work, described in the specification, and illustrated with figures, or may be used as a separate time-piece, or as an orrery. It consists of the work of a horizontal or vertical watch, fixed in a box or globe, representing the earth. "I fix," says Mr. Schmidt, the hour-hand wheel a weight; and the box, with the watch and weight; are fixed to the lever, through which the steel centre or axis, made of hardened steel turned very smooth and thin ro prevent friction, is fixed. On the other end of the lever is attached a box, containing lead sufficient to counter-balance the watch in every position when ia me

to

tron;

tion; to obtain which with facility, the weight should be fastened in such a manner as to be moveable out and in, upwards and downwards, &c. when adjusting it, the proper weight and quantity of the counterpoise should be found by trials, as the weight and size of different time-pieces are not alike." In that recommended by Mr. S. the box containing the watch is three quarters of an inch high, and the distance from the steel centre, is one inch and seven-eighths long: the counterpoise is one inch and a quarter in diameter, and half an inch high; and the distance from the steel centre is two inches and one-eighth of an inch long, the weight fixed to the hour band wheel, forms a semi-circle, and is the one-eighth of an inch thick: the whole rests upon two ornamental and jewelled supporters, or friction rollers, which are screwed upon a stand, upon which is also fastened a supporter for the rim, serving as a dial, which may be divided into twelve, or twenty-four hours, according to the construction of the time-piece; the hours and minutes are shewn by one hand only, or, if required, a nonius may be applied to subdivide the minutes. The centre piece serves to represent the sun. To use this apparatus as a nocturnal dial, the reflector is fixed

to the steel centre, and is confined withia the ornamental case or vase, that contains the lamp and magnifier; the hand shewing the hours is fixed within the case. By this contrivance, the watchwork is not exposed to the heat of the lamp, as in the manner described with the double dial. To represent the increase and decrease, as well as the regular revolution of the moon round the earth, an apparatus is fixed to the back of the globe or box, in such a manuer as to make the moon invisible when between the sun and earth, and then, when turning round, gradually to increase, shewing the phases on the proper day; for which reason, the number of days in the month are engraved upon a brass circle, fixed round the globe. The motion is effected by a little weight fixed to the axis of a pinion, with six teeth, this pinion acting into a wheel with thirty teeth. To the axis of this wheel is attached the bent arm of the moon, the other end of this arm serving as a counterpoise to the weight of the moon; this apparatus, turning round with the box or globe, occasions the pinion to be turned by the weight, always hanging perpendicularly, and thereby causing the wheel, with the moon, to move one tooth every day.

TOPOGRAPHY.

Sketches in North Wales; consisting of Six Plates, coloured to resemble Drawings, accompanied with Letter-press Illustrations, descriptive of Local Scenery, Customs, and Occupations of the Inhabitants of the Principality. Drawn and Engraved by J. W. Harding. Fol. 11. 11s. 6d.

The History and Antiquities of the County of Surrey, by the late Rev. Owen Manning. Enlarged and continued to the present Time, by William Bray, esq. Vol. II. 41. 4s.; large paper, 61. 6s.

VOYAGES AND TRAVELS.

Travels in various Parts of Europe, Asia,

Professor of Mineralogy in the University of Cambridge. Part the First: Russia, Tartary, and Turkey. 4to. 51. 5s.

Remarks on several Parts of Turkey. Part I. Ægyptiaca; or some Account of the Ancient and Modern State of Egypt, as obtained in the Years 1801 and 1002. By William Hamilton, esq. F.A S. accompanied with Etchings from Original Drawings by he late Charles Hayes, of the Royal Engineers. Royal 4to. 41. 4s.

A Tour to Hafod in Cardiganshire, the Seat of Thomas Johnes, esq M.P. By James Edward Smith, esq. M.D. F.R.S. Super royal

folio.

THE EXHIBITION OF THE ROYAL ACA

DEMY OF LONDON, 1810. (Continued from page 481.) 148. Cleopatra dissolving the Pearl; the original Design for Painting executed on the Great Staircase at Burleigh. T. Stothard,

R. A.

a

HIS is a sketch, but it is of that vi

those of Rubens, who mostly sketched in oil. The coloring, chiaroscuro, and local tints, are of that brilliant harmonizing pature, that evinces the hand of a master, and the design exhibits the result of deep thinking.

166. Benevolence, by H. Corbould; is a well-imagined little picture, well drawn and clearly coloured, but the head of the old man is rather too obtrusive and equivocal; at first sight it is doubtful what it is meant for.

Of 167 and 190, two pictures in the class of historical or fancy works, by Drummond, nothing can be said in their favor; bad grouping, ill coloring, and an affected manner of handling, overpower the real merits they possess. More simplicity, and a little regard for nature, would improve the style of this artist.

The next objects that our slight sketch admits of, are the portraits: among which, most distinguished for grace or dignity of treatment, or excellent coloring, are, 32. Lord Grenville, by T. Phillips, R. A. 42. The Persian Ambassador, Sir Wm. Beechy, R.Á. 61. Lord Custlereagh, and 67. Mr. Canning, both by T. Lawrence, R.A. 79. Walter Scott, esq. author of Marmion, &c. H. Raeburn.

shire, J. Lonsdale; this portrait ranks among the best of the present exhibitim, and is at once simple and dignified in character, and vigorous in execution. 401. Mrs. Owen. 402. Children of Lade Mildmay, by Edridge, 493. A Nobleman, J. Northcote, R. A. 505. J. Elmes, esq. J. Lonsdale. Among the miniatures, Robertson, Haines, Mrs. Singleton, New ton, Davis, Watts, Pope, and Englehart, are principally conspicuous; the former (Robertson) by his large portraits of Messrs. P. Coxe, Wilkie, A.R.A. and Gwilt, which certainly are minong the finest miniatures ever produced.

The landscapes of this year are not very numerous, but of a high class of art. No. 29. Southampton, by Mosslight, Pether; is a correct representation of the place, and a faithful transcript of a moonlight effect. 44. Elgin Cathedral, W. Wilson, is well managed. 52. Landscape on u Lake, Evening, P. J. De Loutherbourg, partakes of the usual excellencies of this eminent master's works; as does No. 20. Landscape, Morning, by the same. 55. A Fisherman's College, by Miss H. Gouldsmith, is a faithful tran script of nature. 85. Lowther Castle, Westmorland, the Seat of the Earl of

Lonsdale;