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Elmore Helf died on September 16, 1968, in Columbus, Ohio, at the age of 76. According to an obituary published in ‘Stained Glass Quarterly’ he was remembered as “one of the oldest active members of the Stained Glass Association of America, his firm the Franklin Art Glass Studios having been members for over forty years.” [7]
Tempered or toughened glass is a type of safety glass processed by controlled thermal or chemical treatments to increase its strength compared with normal glass. Tempering puts the outer surfaces into compression and the interior into tension .
Annealing is a process of slowly cooling hot glass objects after they have been formed, to relieve residual internal stresses introduced during manufacture. Especially for smaller, simpler objects, annealing may be incidental to the process of manufacture, but in larger or more complex products it commonly demands a special process of annealing in a temperature-controlled kiln known as a lehr. [1]
Toughened glass is processed by controlled thermal or chemical treatments to increase its strength compared with normal glass. [6] Tempering, by design, creates balanced internal stresses which causes the glass sheet, when broken, to crumble into small granular chunks of similar size and shape instead of splintering into random, jagged shards.
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Inside the restaurant, guests find glamorous details like crystal chandeliers and a massive stained glass window behind the counter. McDonald's in Porto, Portugal. saiko3p/Shutterstock.
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