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0_c9f119bd1739cac7e9201375dbb5f33d
2010-11-15 17:15:41

Fiberglass consists of numerous extremely fine fibers of glass. Although experimented with throughout history actual glass fibers were not mass produced until the invention of finer machine tooling. A dress with glass fibers was first worn in 1893 by stage actress Georgia Cayvan. Russell Games Slayter invented, in 1938, what is commonly known as fiberglass today. It is commonly used for insulation. Carbon fiber is also a somewhat similar but more expensive technology used in place of...

25_189e43a49b73767fbf8377afb7e64593
2010-09-29 16:52:36

The incandescent light bulb provides a source of electric light through incandescence. The bulb works by passing current through a filament which heats to a temperature that produces light. The glass bulb that contains the filament prevents oxidation of the hot filament. The bulbs are also called electric lamps. Incandescent bulbs come in a various sizes and voltages. They can range from 1.5 volts to 300, require no external regulating equipment and have low manufacturing costs. They work...

0_05bb49c4320eccb26808c7ee29dd7bc5
2009-06-19 16:25:24

Aluminum (or aluminium) is a soft, lightweight, silvery metal. It is an element in the boron group on the periodic table of elements, with the symbol Al and atomic number 13. On the earth's crust, aluminum is the most abundant metal, and the third most abundant of all elements on the earth's crust, after oxygen and silicon. It accounts for 8% of the weight of the Earth's solid surface. Because aluminum is a highly reactive metal, it doesn't occur in nature in a pure form. Aluminum forms a...

28_f3cb40f4d2c3e26443d6572532294b99
2005-05-26 10:49:47

Graphite (named by Abraham Gottlob Werner in 1789, from the Greek γραφειν: "to draw/write", for its use in pencils) is one of the allotropes of carbon. Unlike diamond, graphite is a conductor, and can be used, for instance, as the material in the electrodes of an electrical arc lamp. Occurrence Associated minerals include: quartz, calcite, micas, iron meteorites and tourmalines. Notable occurrences include New York and Texas in the USA, Russia, Mexico, Greenland,...

28_79c74169055c7a23d7c62aada24a32a2
2005-05-26 09:40:46

Lead is a chemical element in the periodic table that has the symbol Pb (L. Plumbum) and atomic number 82. A soft, heavy, toxic and malleable poor metal, lead is bluish white when freshly cut but tarnishes to dull gray when exposed to air. Lead is used in building construction, lead-acid batteries, bullets and shot, and is part of solder, pewter, and fusible alloys. Lead has the highest atomic number of all stable elements. (But see the article on Bismuth, which has a half life so long it can...

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Word of the Day
baudekin
  • A rich embroidered or brocaded silk fabric woven originally with a warp of gold thread.
'Baudekin' seems to be an alternative form of 'baldachin,' from the Italian 'Baldacco,' Baghdad, the city where the material was made.
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