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Show HOW MANTFACTl'RKKS OF GLASS TURN OUT THEIIt WOP.K.-Accordlnj WOP.K.-Accordlnj to a glusa expert, the most Interesting part of the manufacture of glass Is Its get ; gruphy. Ue says the glass In your milk bottle, for .lrmtunct was assembled from the ends of the earth, and upon being amera- : bled sturted Its hack ward Jour-ney Jour-ney to the fur corners. As a i common example, let us coo- j slder the mason Jar. This Jar , starts Its rareer In quarry In . Went Virginia as common sand. ; To this Is added soda ash from . Ohio; llim-sione from Mlchlgun; feld-Kpur from North Carolina; niter from the mountain deserts . : of Chile in South America; an-tlmony an-tlmony from Utah; a small amount of cobalt from Canada, and selenium, a sister of sulphur, sul-phur, from Montana. All these materials of all colors, compnsl-: compnsl-: tlons and shapes are fused together to-gether to form these Jars, bottles bot-tles and other transparent glassware. glass-ware. A sine cap from Missouri i Is placed on top of the Jar. Inside In-side this cap Is white porcelain ! liner which is made of all the previously mentioned Ingredients Ingredi-ents to which are added fluorspar fluor-spar from Kentucky and cryolite from Greenland. ! Upon reaching the glasshouse ; these materials are mixed thor-! thor-! oughly In the proper proportions ; and fed Into a huge furnace ; called a tank. The average tank ! holds from 100 to S00 tons of the liquid. A (Ire In the bottom j ; of the tank plays over the liquid i constantly raising tta tempera- i i; ture to 2,000 degrees. The mix- : ture Is continuously fed In at one end of the furnace while the finished gloss la drawn from the ; other. It tukes from one to two ; days for the glass to travel the ' length of the furnace which may he from 20 to 40 feet Ions. When ! the glass comes from the fur- mice It is stiff like black mo- : ': lasses In winter. Its property of i gradually hardening on cooling nllowa It to be blown or worked ; Into-various shapes. In the old days. ftU glnss wits blown and pressed 'entirely' by' hand. But : now machines do all the blowing and pressing much faster and ; : more accurately than man. : Pathfinder Magazine. |