Warwick, brassfounder; for an improvement or improvements in tubes or rods, produced by a new method or methods of manufacturing them, and in manufacturing the same; with various other improvements, into parts of bedsteads and other articles. Dated Dec. 4, 1827.-In six months.

To John Meaden, of Milbrook, near Southampton, in the county of Hants, coach-maker; for certain improvements on wheels for carriages. Dated Dec. 4, 1827.-In six months.

To Samuel Wilkinson, of Holbeck, in the county of York, mechanic; for improvements in mangles, which he intends to denominate Ballman's patent cabinet mangle. Dated Dec. 4,

1827.-In six months.

To Maurice de Jough, of Warrington, in the county of Lancaster, cotton-spinner; for an improvement or improvements in machines, adapted for spinning, doubling, twisting, roving, or preparing cotton and other fibrous substances. Dated Dec. 4, 1827. In six months.

To Thomas Tyndall, of Birmingham, in the county of Warwick, gent., who, in consequence of a communication made to him by a foreigner residing abroad, is in possession of certain improvements in the manufacture of buttons, and in the machinery or apparatus for manufacturing the same. Dated Dec. 4, 1827.-In six months.

To Daniel Ledsam and William Jones, of Birmingham, in the county of Warwick, manufacturers; for certain improvements in machinery for cutting sprigs, brads, and nails. Dated Dec. 4, 1827. In six months.

To Joseph Robinson, of Merchant's-row, Limehouse, in the county of Middlesex, brush-maker; for an improvement in the manufacture of brushes of certain descriptions, and in the manufacture of a material or materials, and the application thereof to the manufacture of brushes and other purposes. Dated Dec. 4, 1827.-In six months.

To Paul Steenstrup, of Basing-lane, in the city of London, esq. for certain improvements in machinery for propelling vessels; which improvements are also applicable to other purposes. Dated Dec. 11, 1827.-In six months.

To John Harvey Sadler, of Hoxton, in the county of Middle

sex, mechanist: for certain improvements on power-looms, for the weaving of silk, cotton, linen, wool, flax, and hemp, and all mixtures thereof. Dated Dec. 13, 1827.-In six months.

To Ralph Bewcastle, of Newcastle-upon-Tyne, in the county of Northumberland, millwright; for a new and improved method of ballasting ships and other vessels. Dated Dec. 13, 1827.— In six months.

To Robert Stein, of Regent-street, Oxford-street, in the county of Middlesex, gent.; for an improvement in applying heat to the purpose of distillation, Dated December 13, 1827.In six months.

To Frederick Benjamin Geithner, of Birmingham, in the county of Warwick, brass founder; for certain improvements on castors for furniture and other useful purposes. Dated Dec. 13, 1827.-In six months.

To Henry Peto, of Little Britain, in the city of London, surveyor and builder; for an apparatus for generating power. Dated December 13, 1827.-In six months.

To Joseph Anthony Berrollas, of Nelson-street, City-road, in the parish of Saint Luke, in the county of Middlesex, watch manufacturer; for a method of winding up a pocket watch or clock without a key, which he calls Berrollas's keyless watch or clock; and also for a certain improvement, to be applied to his late invented detached alarum watch. Dated Dec. 13, 1827.— In two months.

To Andrew Motz Skene, of Jermyn-street, in the county of Middlesex, esq. a lieutenant in our royal navy; for an improvement or improvements in the mode of propelling vessels through the water, and for working under-shot water mills. Dated Dec. 15, 1827.-In six months.

To John Lee Stevens of Plymonth, in the county of Devon, merchant; for a new or improved method or methods of propelling vessels through or on the water, by the aid of steam, or other means or power; and for its application to other purposes. Dated December 18, 1827.-In six months.

To Thomas Tyndall, of Birmingham, in the county of Warwick, gent.; who, in consequence of a commuuication made to him by a foreigner residing abroad, is in possession of certain

improvements in machinery to be employed in making nails, brads, and screws. Dated Dec. 18, 1827.-In six months.

To John George, of Chancery-lane, in the county of Middlesex, esq. barrister-at-law; for an invention for preserving decked ships or vessels, so as to render them less liable to dry rot; and for preserving goods on board such ships and vessels from damage by heat. Dated Dec. 18, 1827.—In six months.

To Thomas Stanhope Holland, of the city of London, esq.; for certain combinations of machinery for generating and communicatiug power and motion, applicable to propelling or fixed machinery, as also floating bodies, carriages, and other locomotive machines. Dated Dec. 19, 1827.-In six months.

To William Harland, M.D. of Scarborough, in the county of, York; for certain improvements in apparatus or machinery for propelling locomotive carriages'; which improvements are also applicable to other useful purposes. Dated Dec. 21, 1827.—In six months.

To Charles Augustus Ferguson, of Mill-wall, in the parish of All Saints, Poplar, in the county of Middlesex, mast maker; and James Falconer Altee, of Prospect-place, Deptford, in the county of Kent, gent.; for certain improvements in the construction of made masts. Dated Dec. 22, 1827.-Iu six months.

To William Hale, of Colchester, in the county of Essex, merchant; for certain improvements in machinery orapparatus for propelling vessels. Dated Dec. 22, 1827.-In six months.

GILL'S

TECHNOLOGICAL REPOSITORY.

VIII.-On Artificial Incubation, or Hatching Poultry in Stoves heated by Hot Water continually circulating through them, the fire being also regulated by a Pyrometer; and which methods are also peculiarly applicable to heating Hot-houses, Green-houses, &c. By M. BONNEMAIN *.

WITH A PLATE.

THE Egyptians have been for time immemorial in possession of a method of hatching chickens without the help of hens, by means of furnaces of a particular construction, known by the name of mamals. The inhabitants of the village of Bermé, at certain seasons of the year, also employ furnaces heated by means of lamps in hatching chickens for sale; but their process, the result of long practice, and favoured by the climate of their country, does not generally succeed with others; and therefore, after making numerous experiments, in order to obtain similar results, all those who were engaged in the pursuit have abandoned it, owing to the uncertain success attending it. M. Reaumur has also published many ingenious observations on artificial incubation; but M. Bonnemain, a French physician, is the only person who, after studying with great care all the circumstances which promote the natural incubation, has been able to hatch eggs in a constant, and even more certain manner, than is ordinarily found to take place with the fowls in our poultry yards.

M. Bonnemain's apparatus consists, firstly, of a calori* From the Dictionnaire Technologique.

VOL. II.

fére, intended to cause the hot water to circulate; secondly, of a regulator, adapted to maintain an equal degree of temperature; and, thirdly, of a stove, kept constantly heated to the degree proper for incubation, and to which is also attached a cage, intended to keep the young chickens warm for the first few days after their being hatched. We shall describe these three parts successively:

The calorifére is so constructed as to transmit the heat of the fire to all parts of the stove, by means of tubes, through which the hot water circulates. In plate II., figs. 1, 2, 3, 4, and 5, it is represented in plan, section, and elevation. It is composed of a copper cylindrical fireplace A, containing a grate B, which separates it from the ash-pit. The fire-place is everywhere surrounded with the water contained in the cylindrical boiler c, and which boiler has likewise five tubes, through which the flame, smoke, and heated air from the fire is made to circulate, so that the greatest part of its heat is communicated to the water before it escapes by the chimney.

An adjutage, or connecting-joint D, affixed upon the top of the boiler, as shown in fig. 10, forms a communication from the interior of the boiler with the vertical tube D G, and which is united with the horizontal tube E F, to which is soldered a long transversal tube, or adjustment, into which an equal number of tubes, as 6, 8, 10, &c. are fitted. This row of tubes is introduced through the partition wall into the stove, through which it passes in a gently inclining position, and passing out on the opposite side, the same tubes are curved, and again enter the stove about eight or nine inches below; thence passing through it, they again come through the partition wall, and are again bent and passed through the stove, and so on two or three times repeatedly; the two last times, however, M. Bonnemain caused them also to pass through a kind of cage, O, P, Q, and which had a sheep-skin with its wool adhering to it, suspended within it, under which the young chickens could nestle, and keep themselves warm; the row of tubes was