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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 candoluminescence ...
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]
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.
He reported that the light could be observed 68 miles away and would cast a strong shadow at a distance of thirteen miles. [1] Drummond left Ireland for a period prior to the Reform Act 1832 . For his services to the Whigs, acting as secretary to Lord Spencer , Lord Brougham had him awarded a pension 300 pounds per annum.
They give light immediately on startup, but usually need a few minutes to restrike if power has been interrupted. Because of the light emitted by the filament, they have slightly better color rendering properties than mercury-vapor lamps. Self-ballasted lamps are typically more expensive than a standard mercury-vapor lamp.
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Distribute the lime juice, cucumber slices, and mint leaves (if using) evenly between two tall cocktail glasses. Using a muddler or the handle of a wooden spoon, muddle the cucumber slices and ...
This straining led first to temporary nystagmus and then to a permanent disability. Mild nystagmus would self-correct if a miner ceased to perform this work, but if left untreated would force a man to give up mining. [6] The lower levels of light emitted by safety lamps caused an increase in the incidence of nystagmus. [7]