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adhesive advantage air-work applied bags beds boats bottles boxes canvas caout caoutchouc ivory caoutchouc whalebone cemented CHAPTER Charles Goodyear Charles Macintosh chouc cloth coated coated cloths colour combination cord cork cotton covered cushions cylinder described durable elastic compound elastic fabrics embossed essential oil experiments fibres fibrous fabrics gloves gum-elastic sponge gutta percha heat immersed improvement inch India rubber INDIA-RUBBER MANUFACTURE inflated invention inventor kind life-preservers liquid lock springs machine manner masticated material metal method mixed moulds naphtha native gum obtained patent perforated pieces plated fabrics pontoons portable present produced properties purpose rendered represented in plate self-inflating sheets shoes solution solvent specimens spread springs straps substance suitable sulphur surface temperature thickness Thomas Hancock thread tion tissue tree trunks tube United valve various vegetable leather vellum vulcanised vulcanized gum-elastic vulcanized rubber vulcanizing process waterproof wearing apparel whalebone board wood writer