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Limelight (also known as Drummond light or calcium light) [1] is a non-electric type of stage lighting that was once used in theatres and music halls. An intense illumination is created when a flame fed by oxygen and hydrogen is directed at a cylinder of quicklime ( calcium oxide ), [ 2 ] due to a combination of incandescence and ...
The light is produced either directly by the flame, generally by using special mixes (typically propane or butane) of illuminating gas to increase brightness, or indirectly with other components such as the gas mantle or the limelight, with the gas primarily functioning to heat the mantle or the lime to incandescence. [1]
Work in Petra's az-Zantur area has indicated that there has been an evolution from non-permanent housing (tents) to built structures, with sedentarisation happening only gradually and tents coexisting with stately mansions even in later phases of evolution. Even the well-researched, stone-built and elaborately decorated Nabataean az-Zantur ...
The Middle East, with its particular characteristics, was not to emerge until the late second millennium AD. To refer to a concept similar to that of today's Middle East but earlier in time, the term ancient Near East is used. This list is intended as a timeline of the history of the Middle East.
This, in turn, controls the flow rate of the gas and the size of the flame at the burner, and thus the amount of light it produces. This type of lamp generally has a reflector behind the flame to help project the light forward. An acetylene gas powered lamp produces a bright, broad light.
Lime pit in Judaea. A limepit is either a place where limestone is quarried, or a man-made pit used to burn lime stones in the same way that modern-day kilns and furnaces constructed of brick are now used above ground for the calcination of limestone (calcium carbonate, CaCO 3) and by which quicklime (calcium oxide, CaO) is produced, an essential component in waterproofing and in wall ...
Pharos was a small island located on the western edge of the Nile Delta.In 332 BC, Alexander the Great founded the city of Alexandria on an isthmus opposite Pharos. . Alexandria and Pharos were later connected by a mole [6] spanning more than 1,200 metres (0.75 miles), which was called the Heptastadion ("seven stadia"—a stadion was a Greek unit of length measuring approximate
During the European Middle Ages, many Roman lighthouses fell into disuse. Some did remain functional, such as the Farum Brigantium, now known as the Tower of Hercules, in A Coruña, Spain, and others in the Mediterranean Sea, such as the Lanterna at Genoa. As navigation improved, lighthouses gradually expanded into Western and Northern Europe. [5]