It was concluded from this, that the tendency of the oily matter to remain in solution favoured the separation of the acid into two parts; the one less concentrated, which took up the greatest part of the oil, and the other more strong in acidity, and the particles of which were condensed.

There are other facts that prove this residuum to be really analysed by means of crystallisation.

The moiety which had been condensed by a temperature of 8°+0 preserved all its solidity during forty-eight hours exposure to a temperature of 14°+0. If, after being melted, it was exposed to a temperature of 10°+0 it crystallised in a mass, absorbing air and producing heat. On the contrary, the other moiety that resembled ya mother water could not be crystallised by a temperature of 7o+0, although its specific gravity was probably

438=1.057.

The acid that crystallised a mass at 10°+0 R. had only the specific gravity of 41.044. It appeared to be the most feeble of all in specific gravity. Nevertheless it is the more powerful as to acidity as if its molecules enjoyed the greatest force of cohesion. It is also the most inflammable, and possesses the greatest capacity for saturation. In reality, 1st. if an inflaming body is brought near this acid, the crystals of which are white, previously heated to the mean degree of ebullition, it takes fire rapidly, and burns with a blueish flame; while the specific gravity of 1.062 does not burn equally well until it is in perfect ebullition. The inflammability of the mother water is not here mentioned, because the great quantity of the oil that it contains renders the effect so complicated that it is difficult to form a proper judgment respecting the true cause of its combustion.

2dly. Four assay grains of the acid at 1.044 weighed out in scales sensible to the 20th of a grain, and 72 grains of distilled water, at the temperature of 12o, exactly saturated 16 grains of crystallised, shining, and dry carbonate of potash; whilst four grains of the acid at 1.062 only saturated 12 grains of the same salt.

Note by the Editors.

It appears that Mr. Steinacher is totally unacquainted with decimal arithmetic, and has in the original committed an error in every one of the specific gravities he has quoted in decimal fractions. They are here coras quoted in another

rected from the specific gravities,

They

form. Thus the acid nitre specific gravity is 1.062 he calls 1.620, and so of all the rest.

List of Patents for Inventions, &c.

(Continued from Page 192.)

JAMES CAVANAH MURPHY, of Edward-street, Cavendish-square, in the county of Middlesex, Architect; during a residence of eight years on the Continent he has discovered and found out the manner of designing, making, and forming mosaics and ornaments in the Arabian style manner, and which he purposes to apply to divers arts and manufactures. Dated July 26, 1809. Specification to be enrolled within nine months.

SAMUEL CLEGG, of Manchester, in the county of Lancaster, Engineer; for a rotative engine, the piston of which makes a complete revolution at a distance from the revolving axis, shaft, or cylinder. Dated July 26, 1809. Specification to be enrolled within two months.

THOMAS

THOMAS BOTFIELD, of Hopton Court, in the county of Salop; for a method of constructing an iron or metal roof for houses or other buildings. Dated July 26, 1809. Specification to be enrolled within six months.

RICHARD HEAPS, of Holywell-street, in the parish of St. Leonard Shoreditch, and county of Middlesex, MillLead and Patent Pipe-manufacturer; for an improved method of forming pipes, and sundry other articles, in lead, pewter, or tin, or metals of that nature. Dated July 26, 1809. Specification to be enrolled within two months.

DAVID LOESCHMAN, of Newman-street, in the county of Middlesex, Piano Forte-maker; for certain improvements in the musical-scale of keyed-instruments with fixed tones, such as pianos, organs, &c. Dated July 26, 1809. Specification to be enrolled within two months.

CHARLES SEWARD, of Lancaster, in the county palatine of Lancaster, Tin Plate-manufacturer; for a new or improved street-lamp and burner, and lantern-head, for street and other lamps and lanterns. Dated July 26, 1809. Specification to be enrolled within two months.

WILLIAM HUTTON, of Sheffield, in the county of York, Merchant; for a method of making sickles and reaping hooks with iron in steel backs fixed upon the blades thereof, whether such blades be forged, rolled, cast, hammered, or otherwise manufactured. Dated July 31, 1809. Specification to be enrolled within one month.

Specification of the Patent granted to WILLIAM FRANCIS SNOWDEN, of Oxford-street, in the Parish of Saint George, Hanover-square, and County of Middlesex, Engine-maker; for certain Improvements in an Engine for cutting Hay and Straw into Chaff, and for cutting other Articles. Dated February 4, 1808.

With a Plate.

To all to whom these presents shall come, &c. NOW KNOW YE, that in compliance with the said proviso, I the said William Francis Snowden do declare that my said invention consists of the two following particulars : First, a new, more simple, and better way of bringing the straw to the knife; secondly, a new mode of compressing the article when the knife is cutting it: but I desire, in the most clear manner, to express, that my invention does not extend to or comprise a machine altogether on an entire new principle, as I use sundry parts in my machine which have existed before the date VOL. XV.-SECOND SERIES.

of

of my patent in old machines; but I do hereby describe and explain my said invention in manner following.

First, instead of the straw sliding forward on the bottom of the box as in old machines, the box in my machine, by a sliding motion on the frame B, Fig. 5, (Pl.XII.) in the drawings hereunto annexed, and with the assistance of the frame or weight c, Fig. 2, brings the straw and other articles forward with it to be cut; and whilst the knife is cutting the straw or other articles, a retrograde motion is given to the box by the projecting part b of the lever a, Fig. 4, acting against the regulating nutƒ, Fig. 6, by which the cut is regulated to any length required, and so on alternately: whilst the knife is rising nearly to the top the straw or other articles come forward with the box; and whilst the knife is cutting, the compresser g, Fig. 2, acts upon the straw and other articles so as to prevent them going backwards with the box A. (See Fig. 5.) The forward motion of the box is produced by the action of the lever a when the knife rises, which causes the frame or weight c, Fig. 3, to act against the two pieces e e, fastened for that purpose to the inside of the box A, Fig. 6.

Secondly, the compresser g, by a more simple contrivance, presses the articles with less labour than was ever known before, and acts upon the articles that are to be cut with nearly the same degree of pressure, whatever be their thickness, and which is done in the following manner. The lever a acts on a pin in the frame of the compresser g, as described in Figs. 3 and 4. At the inner end of the lever a is the frame or weight 6, with the roller d. At the other end is the connecting rod i, by which the motion of the back, to which the knife is fixed, is communicated to the lever a, and also the