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Fluorescent lamps in various embodiments. Since their introduction as a commercial product in 1939, many different types of fluorescent lamp have been introduced. Systematic nomenclature identifies mass-market lamps as to overall shape, power rating, length, color, and other electrical and illuminating characteristics.
The spectrum of light emitted from a fluorescent lamp is the combination of light directly emitted by the mercury vapor, and light emitted by the phosphorescent coating. The spectral lines from the mercury emission and the phosphorescence effect give a combined spectral distribution of light that is different from those produced by incandescent ...
Battens are also used in metal roofing to secure the sheets called a batten-seam roof and are covered with a batten roll joint. [2] Some roofs may use a grid of battens in both directions, known as a counter-batten system, which improves ventilation. Roofing battens are most commonly made of wood or metal, but can be made of other materials.
Sports and recreational sound systems often face environmental challenges as well, such as the need for weather-proof outdoor speakers in outdoor stadiums and humidity- and splash-resistant speakers in swimming pools. Another challenge with sports sound reinforcement setups is that in many arenas and stadiums, the spectators are on all four ...
Drawing up a comprehensive list of words in English is important as a reference when learning a language as it will show the equivalent words you need to learn in the other language to achieve fluency.
A heroes' welcome for Welsh Olympians and Paralympians at the Senedd building, 2012. As the National Olympic Committee (NOC) for the United Kingdom, the British Olympic Association (BOA) membership encompasses the four Home Nations of the United Kingdom (England, Northern Ireland, Scotland and Wales, who notably compete separately in many international sports outside Olympic competition for ...
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