^tM 



SPECIFICATION OF PATENT. 85 



They are not stiffened by cold, or melted by any degree of heat, 

 unless placed in the fire. 



In some cases, when a fabric of a light color is desired, I dis- 

 pense with the sulphur and white lead, and after it is finished I 

 boil it in water with sulphur, or expose it to the weather, and 

 especially to the sun's rays, after having brushed it over with 

 the flour of sulphur while it is yet adhesive. The effect of the 

 sulphur applied in this way, is to destroy entirely all the adhesive 

 properties of the gum-elastic. 



In order to cleanse and free the goods from the sulphur, and 

 from the smell of sulphur, I boil them in lime, potash, and 

 other alkalies. 



In the manufacture of these fabrics, the proportions of the 

 lead and sulphur may be considerably varied, and oxides of 

 metals generally, or other pigments, may he substituted for the 

 lead. 



Signed in our presence, December 6, 1841. 



J. W. Roberts, 

 Geo. Buckland. 



Charles Goodyear. 



The improvement which I claim, and wish to secure to myself 

 by letters patent, consists in compounding the fabrics with a 

 large proportion of sulphur and white lead, as herein specified ; 

 and the fabrics being thus suitably prepared to endure the heat, 

 and in next applying a high degree of heat, whereby the impuri- 

 ties of the fabrics are entirely removed, as herein specified, or 

 in any manner analogous thereto. 



I also claim as my improvement the use of fibrous substances, 

 either with gum-elastic, or this compound being mixed w"ith the 

 same, or made use of in the sheet or web. 



I furthermore claim as my improvement the India rubber 

 fabric without tissue of any kind, and the boiling and drying 

 India rubber goods in contact with sulphur, and afterwards 

 cleaning them with potash, or other solvents of sulphur. 



In testimony whereof, I, the said Charles Goodyear, hereto 



