. India rubber world. , andto a certain extent becomes incorporated as a part of thearticle so formed. The tirst is used very largely in the manu-facture of leather goods, such as boots and shoes, bags, pocket-books and similar articles. Tlie compound cements are mainlyused in the various rubber industries, such as waterproofclothing manufacture, the druggists sundry business and inautomobile tire work. The manufacture of those cements used in the production ofleather footwear is a comparatively simple matter. The cementis a solution of gum in naphtha, and while there is no secret inits compos
. India rubber world. , andto a certain extent becomes incorporated as a part of thearticle so formed. The tirst is used very largely in the manu-facture of leather goods, such as boots and shoes, bags, pocket-books and similar articles. Tlie compound cements are mainlyused in the various rubber industries, such as waterproofclothing manufacture, the druggists sundry business and inautomobile tire work. The manufacture of those cements used in the production ofleather footwear is a comparatively simple matter. The cementis a solution of gum in naphtha, and while there is no secret inits composition, every manufacturer has his own formula asto the proportion of gum to the solvent, and also the kind andquality of the various rubl)crs which enter into his variousgrades. Naphtha is used as the solvent in preference to gasolene orbenzine, because of the higher volatility of the former, and theoiliness of the latter. Gasolene wo/ld evaporate too quicklyfor most purposes where the cement is used, while benzine is. Goodyear Twin Sole-Laying Machine. too heavy and holds sufficient grease to detract from the adhesiveness of the rubber. The finest qualities of rubber cement are made from KnapsackPara, while in some grades a large proportion of Massai is used, and in the cheaper grades lower cost gums, even down to Pontianak. A cement manu-facturer can furnish rubber cement at almost any figure a customer desires, the price bein,g practically determined by the quality and quantity of the gum used. One manufacturer quotes for his best cement one dollar a gallon, but anothers best sells in quantity at $, while a leading rubber heel manufacturer quotes $ per gallon for his best cement for attaching rubber heels to leather shoes. From these prices the scale runs down to almost anyamount a customer cares to pay, some such preparatiins 1)6- ing quoted as low as thirty cents. The manufactureof such cement isvery simple. Thecrude rubber is cutin small pieces,softened by hotwate
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