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Mechanical fusible links are utilized as the triggering device in fire sprinkler systems and mechanical automatic door release mechanisms that close fire doors in warehouses, etc. Fire dampers in ventilation systems have fusible links so that the dampers close automatically in case of fire, limiting the spread of flame or hot gases through a ...
Wood's metal. Wood's metal, also known as Lipowitz's alloy or by the commercial names Cerrobend, Bendalloy, Pewtalloy and MCP 158, is a metal alloy that is useful for soldering and making custom metal parts, but its fumes are toxic, as well as being toxic on skin exposure.
1989: In May 1989, Sequoia Data Corp. introduced Compumarket, the first internet based system for e-commerce. Sellers and buyers could post items for sale and buyers could search the database and make purchases with a credit card. 1990: Tim Berners-Lee writes the first web browser, WorldWideWeb, using a NeXT computer. [79]
In Stitched from the Soul (1990), Gladys-Marie Fry asserted that quilts were used to communicate safe houses and other information about the Underground Railroad, which was a network through the United States and into Canada of "conductors", meeting places, and safe houses for the passage of African Americans out of slavery.
Around the same time, a pattern called Boteh was gaining popularity in Iran; the pattern was a floral design, and was used to represent elite status, mostly serving to decorate royal objects. [8] The pattern was traditionally woven onto silk clothing using silver and gold material. [8]