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Specification of the Patent granted to JOSEPH JEWELL, of Stratford-le-Bow, in the County of Esser, Christ; for a Method of preparing or reducing to an impalpable Powder, for Medicinal Use, the Substance commonly called or known by the Name of Calomel, whereby the Process employed of levigating the same is rendered unnecessary. Dated November 17, 1807.

To all to whom these presents shall come, &c. NOW KNOW YE, that I the said Joseph Jewell, in pursuance of the said proviso in the said Letters Patent contained, do hereby describe and ascertain the nature of my said invention, and in what manner the same is to be performed, as follows: Calomel or mercurius dulcis, as usually prepared, is at first a hard crystalline substance, and requires to be pounded and triturated with water, either in a mortar, or on a slab with a muller, or in a mill; after having been ground or triturated for a considerable time, more water is added, and the whole well stirred up. The finer particles which remain suspended for a short time being poured off with the water into another vessel and left to subside, the water is then decanted, and the fine powder dried for use. The coarser particles are again submitted to the operations of grinding and washing over until the whole be finished. Now the nature of my invention is to produce the effect of the grinding or trituration above described in a more perfect manner during the last sublimation of the calome, which I do as follows: I take calomel or mercurius dulcis broken into small pieces, and put it into an earthen erucible of the form of a long barrel, so as to fill about

one

one half thereof; I place the crucible on its side in a furnace provided with an opening, through which the mouth of the crucible projects about an inch. I then join to the mouth of the crucible an earthenware receiver, having an opening at its side to receive the open end of the crucible; this receiver is about half filled with water, I lute the joint with a mixture of sand and pipeclay. The receiver has a cover, which cover has a side continued upwards for containing water, with a chimney or tube in it to allow the escape of steam from water below. I then apply a fire around the crucible suffi, cient to raise the calomel in vapour, and force it through the mouth of the crucible into the receiver, where by the water while cold, or assisted by the steam when it becomes hot, it is instantly condensed into an impalpa- . ble powder. It is proper to wash the product over with water before it is dried, to rid it of any coarser particles which may form about the mouth of the crucible. My patent does not rest upon any particular shape or composition of the apparatus or any part thereof; but that which I claim as my discovery to be secured to me is the rendering of calomel or mercurius dulcis fit for medicinal use by a sublimation or distillation so conducted as suddenly to condense the vapours, and prevent the concretion or crystallization of the product; thus rendering trituration, or what is commonly termed levigation, unnecessary.

In witness whereof, &c.

Specification

Specification of the Patent granted to EDWARD WEEKS, of Llaveny Hall, in the Parish of Henlau, in the County of Denbigh, North Wales, Gardener; for a forcing Frame on a new and improved Construction for raising and forcing of Cucumbers, Melons, Strawberries, and various other Fruits and Plants which require the Application of artificial Heat to rear or ripen the same.

Dated March 17, 1808.

With an Engraving,

To all to whom the presents shall come, &c. NOW KNOW YE, that in compliance with the said proviso, I the said Edward Weeks do hereby declare, that the said invention consists of a double frame of any conve nient size or dimensions, made chiefly of wood; the external frame covered with glass-lights, and constructed nearly similar to those in common use; the internal frame placed within the other, not made so deep, and without any covering, with a boarded bottom sufficiently strong for sustaining the weight of the earth or mould which is placed thereon for the growth and sustenance of the plants, and not on the dung or hot-bed as is the general practice; the internal frame is made deep enough to contain the proper quantity of earth or mould only, and the bottom thereof covers a less area than included within the external frame, so that a space or cavity is left of from two to six inches wide, or more at pleasure, between the ends and sides of the two frames for the admission of the heat to the plants, which passes thereto from the hot-bed through such spaces or cavities, and not to the roots of the plants through the earth or mould as in the common way. The internal frame is VOL. XIII.-SECOND SERIES. M

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