_Claim 1st._ The manufacture of the new varnish compounded of gutta-percha and resin spirit, (crude, rectified, or purified,) as before described. _Second._ The manufacture of the new varnishes compounded of gum damar and resin spirit, or of gum mastic and resin spirit, whether such spirit is rectified and decolorized or rectified only, as before described. WILLIAM HENRY BURKE, Tottenham, manufacturer. For improvements in the manufacture of air-proof and water-proof fabrics, and in the preparation of caoutchouc and gutta-percha, either alone, or in combination with other materials, the same to be applicable to articles of wearing apparel, bands, straps, and other similar useful purposes. Patent dated April 26, 1849. _First._ Mr. Burke proposes to employ a compound of antimony instead of sulphur, for the purpose of rendering caoutchouc, gutta-percha, or their compounds permanently elastic, and unaffected by changes of temperature. The compound is prepared by mixing 1 part of crude antimony with 25 parts of crystallized carbonate of soda, or 20 parts of carbonate of potash, and 250 or 300 parts of water. The mixture is boiled from half an hour to three-quarters, and allowed to precipitate, when the supernatant liquid is run off. The precipitate is then dried and incorporated with the caoutchouc in a masticating machine in the proportion of from five to fifteen per cent. When bands or other articles are to be cut from blocks of caoutchouc, it is taken, while warm, from the masticating machine, and subjected to pressure for one or two days. _Second._ It is also proposed to manufacture driving bands, by spreading the material dissolved in a suitable menstrum, with calender rollers, upon pieces of calico or other fabric, powdered with French chalk, to allow of the easy separation of the two, and to increase the rigidity and durability of gutta-percha driving bands, stripes of some fabric are to be affixed to the wearing parts, and both surfaces coated with the antimonized caoutchouc. _Third._ To remove the shiny appearance of single texture garments, &c., Mr. Burke coats them with the antimonized caoutchouc, dissolved in some suitable menstrum, and mixed with ground silk or cotton, which is stated to have the effect of giving the article the appearance of cloth. _Fourth._ Gutta percha soles and heels are proposed to be defended at the edges, where they are exposed to great wear and tear, with metal tips, shields, and guards. CLAIMS. _First._ The treating caoutchouc, gutta-percha, or their compounds, with the antimony compound. _Second._ The mode of manufacturing driving bands. _Third._ Coating water proof articles with antimonized caoutchouc, mixed with ground silk, cotton, or wool. _Fourth._ The manufacture of gutta-percha soles and heels with metal tips, shields, and guards. DESCRIPTION OF HANCOCK AND CO.’S PATENT GUTTA-PERCHA HEEL TIPS.