Specification of the Patent granted to JOSEPH PRICE, of Gateshead, in the County of Durham, Glass-maker; for several new Methods of making Glass. ༞་ To all to whom these presents shall come, &c. Now KNOW YE,, that in compliance with the said proviso, I the said Joseph Price do hereby declare that the nature of my said invention, and the manner in which the same is to be performed, is as follows; that is to say: The object of my invention is to make glass that, without grinding, shall answer all the purposes of ground glass, by transmitting the light through it in that soft and agreeable manner similar to ground glass; and I effect this by the following means, viz. I prepare a pot of flint glass and a pot of white enamel glass, in the respective proportions after mentioned, and when brought into fusion in the usual way, at a proper temperature for working, I gather or take, in the usual way, with a gathering pipe, from the enamel pot, a quantity of metal, proportioned to the article intended to be manufactured, and cover it with metal gathered or taken in like manner from the flint glass pot, and proceed to blow and form them to the shape of the article required. The enamel will then be pretty equally spread throughout the inside of the said article, and have rendered it nearly of an opake white, rssembling in appearance, and possessing an effect, though more agreeable, similar to that of ground glass in the transmission of light. Practice and experience only can direct the relative proportions of the enamel and flint glass to be used; it will suffice to say, that the quantity of enamel must be sufficient to give the article a white opake appearance, but not so much as to VOL. XXV.-SECOND SERIES. Dd prevent prevent in any material degree the transmission of light through it. The enamel must be of a flake white, otherwise the desired effect will not be perfectly produced, and the flint glass and enamel must be (as terined by the workmen) of the same temper, so as to unite or combine with each other. The effect may also be produced by the following method, viz. Gather or take on a gathering pipe a portion of flint glass, and cover it with enamel, and then cover the enamel with flint; then blow and form them to the shape required, as before directed: the enamel will then be spread between the bodies of flint glass. The two foregoing methods I recommend as best adapted to produce the effect before specified : but it may also be produced, though not in such perfection, by another method, viz. by gathering, as before, a portion of flint glass, and covering it with enamel, and then blowing and forming them as before; the enamel will then be spread on the outside of the article. A degree of opacity may be given to glass by any of the following materials, as substitutes for arsenie, that is to say, calcined tin, commonly called putty, calcined antimony, or calcined bones, or ivory, but not in such perfection as by the enamel before mentioned; I do not, therefore, recommend this latter mode of producing the effect. In order to make flint glass and enamel of the same temper, or so as they will unite or combine with each other, I charge two pots, one for flint glass and one for enamel. The following materials and proportions are for the flint glass, viz. of Lynn sand, or any other sand having similar chemical properties, or calcined flints, in powder, four hundred and twenty pounds; litharge, or lead, two hundred and eighty pounds; pearl ashes, one hundred and forty-seven pounds; nitre, fourteen pounds; cullet, cullet, or broken flint glass, three hundred and thirty-six pounds; manganese, three quarters of a pound. For enamel: of sand, as before, or calcined flints, one hundred and twelve pounds; litharge, or lead, one hundred and twelve pounds; nitre, fifty-six pounds; arsenic, twenty-five pounds; cullet, or broken flint glass, one hundred pounds. N. B. The proportions of the materials may be varied according to their strength in both pots, provided the relative qualities of each pot are maintained so as to agree and unite with each other. The cullet, or broken flint glass may be omitted; but in that case the proportions of the other materials must be varied as the temper of the metal may require. The means of varying the proportions of the other materials are known to all experienced manufacturers. In witness whereof, &c. Specification of the Patent granted to THOMAS WRight, of Great Saint Helens, in the City of London, Broker; for a Method of making a Composition or Mixture for dying Scarlet and other Colours. Dated December 9, 1813. To all to whom these presents shall come, &c. Now KNOW YE, that I the said Thomas Wright, in compliance with the said proviso, do hereby declare that my said invention, and the manner in which the same is to be prepared, is described in manner following; that is to say: One hundred pounds of the composition is composed of about twenty-six parts lac, lake, or lac dye, about forty parts lac spirits, or solution of tin, about Dd 2 twenty twenty-six parts cream tartar, or argol, about one part turmeric, about two parts cochineal, about four parts extract of safflower, and about one part diluted sulphuric acid; one pound whereof I use to dye two pounds weight of cloth, yarn, or stuff, a brilliant scarlet. For purple, violet, lilac, and such like colours, to which cochineal is applicable, add to a solution, of about four ounces of indigo for one pound weight of cloth, from half an ounce to six ounces of the composition, according to the depth of colour or shade required. The quan tity of indigo should also be varied in proportion for the solution. In witness whereof, &c. 1 Remarks and Emendations on a Translation of a Paper on the Art of making Glue, by M. Hermbstaedt, inserted in the last Number of this Work. By THOMAS GILL, Esq. St. James's-street, one of the Chairmen of the Committee of Mechanics of the Society for the Encouragement of Arts, Manufactures, and Commerce, of London., Communicated in a Letter to the Editors. GENTLEMEN, I TAKE the liberty of sending some remarks and emen dations on a translation of a very valuable paper on the art of making glue, by M. Hermbstaedt, in your Repertory for this month, from the Annales de Chimie, viz. Page 175, in enumerating the principal operations, the eighth speaks of bleaching the cakes of glue, which, however, under that head, in page 179, is said not to be the case; but is applicable only to the gelatine liquid. In the same page, 175, in the enumeration of the matters employed in the manufacture of glue, the second mentions |