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requires three days for it to deposit the carmine, so it is evident that the precipitate must be exceedingly light.

This process may answer for the artist, who practises it for his own use; but it would be absurd to employ it in the large way.

Carmine made by using the Salt of Sorrel, termed, "the Superfine Carmine of Madame Cenette, of Amsterdam. We commence by boiling six buckets of river water in a copper basin; and at the moment when the ebullition begins, we add two pounds of Mexican cochineal, finely powdered. We suffer it to boil two hours, at the end of which time, we add three ounces of pure nitre, and a moment afterwards, four ounces of salt of sorrel, and suffer the whole to boil for ten minutes. This done, we remove the basin from the fire, and leave it at rest for four hours; we then draw off the supernatant liquid from the dregs, with a syphon, and deposit it in glazed earthen vessels, where it must remain at rest for three weeks; if any mouldiness should form, at the end of a certain time, it must be removed with a sponge. The water must be drawn off from the vessels with a syphon, and which should be plunged to the bottoms of the vessels, as the carmine appears to adhere thereto. This carmine must be dried in the shade; it is very beautiful, and of such a lustre as to fatigue the eye.

We do not see the use of the nitre; it may, possibly, be an error of the copyist, for natron. The quantity of salt of sorrel also appears enormous; for the rest, the tedious delay of this process, gives room for similar observations with the last; as the decantation is made at the end of four hours, but without the carmine depositing itself, and which it requires three weeks to effect.

(To be continued)

190

LIST OF PATENTS FOR NEW INVENTIONS,

Which have passed the Great Seal since January 23, 1830.

To George Vaughan, of No. 10, Cleveland-street, Mile-end-road, in the parish of Mile-end, Old-town, in the county of Middlesex, engineer; for a machine or pump, for raising water or other fluids. Dated January 23, 1830.-To be specified in two months.

To John Yates, of Hyde, in the county of Chester, calico printer; for a method or process of giving a metallic surface to cotton, silk, linen, and other fabrics. Dated January 26, 1830.-In six

months.

To George Stocker, and Alexander Stocker, both of the parish of Yeovil, in the county of Somerset, gunsmiths; for a cock for drawing liquor from casks, which produces a stop, superior to that which is effected by common cocks, and will continue in use for a onger period of time. Dated January 26, 1830.-In two months.

To John Arnold, of Sheffield, in the county of York, powder flask maker; for an improved spring latch, or fastener for doors. Dated January 26, 1830.-In two months.

To George Frederick Johnson, of Canterbury, in the county of Kent, Tunbridge ware manufacturer; for a machine or apparatus, which is intended as a substitute for drags for carriage wheels, and other purposes. Dated January 26, 1830.-In six months.

To Thomas Bulkeley, of Richmond, in the county of Surry, doctor of physic; for a method of making or manufacturing candles. Dated January 26, 1830.-In six months.

To James Cobbing, of Bury St. Edmonds, cordwainer; for certain improvements on skates. Dated January 1826.-In six months.

To Samuel Wright, of Shelton, in the Staffordshire potteries; for a manufacture of ornamental tiles, bricks, and quarries for

floors, pavements, and other purposes. Dated January 26, 1830. -In six months.

To Robert Bush, of Leeds, in the county of York, gentleman; who in consequence of a communication made to him by a certain foreigner residing abroad, is in possession of certain improvements in the apparatus used for distilling and rectifying. Dated January 26, 1830.-In six months.

To John Revere, of New York, in the United States of America, but now residing in the parish of Saint James, Westminster, M.D.; for a new alloy or compound metal, applicable to the sheathing of ships, and various other useful purposes. Dated January 28, 1830. In six months.

To Joshua Lambert, of Liverpool-street, in the city of London, esquire; for an improvement in the process of making iron, applicable at the smelting of the ore, and at various subsequent states of the process up to the completion of the rods or bars, and a new process for the improving of the quality of inferior iron. Dated February 4, 1830.-In two months.

To George Pocock, of Bristol, gentleman; for improvements in making or constructing globes for astronomical, geographical, and other purposes. Dated February 4, 1830.-In two months.

To John Gray, of Beaumorris, in the county of Anglesea, gentleman; for a new and improved method of preparing and putting on copper sheathing for shipping. Dated February 4, 1830.-In two months.

To Charles Taverner Miller, of Piccadilly, in the county of Middlesex, wax chandler; for certain improvements in making or manufacturing candles. Dated February 4, 1830.-In six months.

To Joseph Clisild Daniell, of Limpley Stoke, in the parish of Bradford, in the county of Wilts, clothier; for certain improvements in the machinery applicable to the manufacturing of woollen cloths. Dated February 6, 1830.-In six months.

To Melvil Wilson, of Warnford-court, Throgmorton-street, in the city of London, merchant; who in consequence of a communication made to him by a certain foreigner residing abroad, is in possession of an improved method of preparing and cleansing paddy, or rough rice. Dated February 6, 1830.-In six months.

To Thomas Robinson Williams, of Nelson-square, Blackfriarsroad,in the county of Surrey, esquire; for improvements in powerlooms, applicable to the weaving of wire, and other materials. Dated February 6, 1830.-In six months.

To Edward Cowper, of Streatham-place, in the county of Surrey, gentleman; who in consepuence of a communication made to him by a certain foreigner residing abroad, is in possession of certain improvements in the manufacture of gas. Dated February 12, 1830.-In six months.

To John Frederick Smith, of Dunstan-hall, Chesterfield, in the county of Derby, esquire; for certain improvements in preparing or finishing piece goods, made from wool, silk, or otherfibrous materials. Dated February 12, 1830.-In six months.

To Joseph Marie Ursule La Rigandell Du Buisson, of Fenchurch-street, in the city of London, merchant; who in consequence of a communication made to him, by a certain foreigner residing abroad, is in possession of a new method of extracting, for the purpose of dyeing, the colours from dye-woods, and other substances used by dyers. Dated February 12, 1830.-In two months.

GILL'S

TECHNOLOGICAL & MICROSCOPIC

REPOSITORY.

XLVIII.-On the Microscope. By THOMAS CARPENTER, Esq. With Remarks and Additions. By the EDITOR.

WITH A PLATE.

(Continued from page 142.)

London, March 8, 1830.

DEAR SIR, I HEREWITH send you a few objects on a much larger scale than those I have before submitted to your inspection. These are more properly adapted for exhibiting under the lantern, lucernal, and solar microscopes; yet, under your compound or single microscopes, you will find much to admire, in the various characters and markings they possess; but on viewing them under the instruments first mentioned, and using a moderate power object-glass, the effect produced will be strikingly grand. In four of the glass sliders are the wing-cases, wings, and hind legs of the blatta, or cock-roach; in another slider are the four wings of a species of osmylus; and between the sixth slider will find scales from the sea perch, the river perch, the flying fish, and the dolphin. In exhibiting these objects under your Adams's lucernal or lantern microscopes, you may thus make choice of suitable ones for those instruments; as I have always found that those objects which are strongly marked are the best adapted for them; as those with delicate lines or characters do not show to any advantage under them.

you

With the above you will also receive several other ob

VOL. VI.

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