Mine Illumination

A miner working under condition of insufficient light over long periods not only impairs his efficiency but also develops an eye disease  known as nystagmus. Before the invention of miners flame safety lamp naked light were used in coal and metal mines. nowadays electric cap lamp are used by every underground worker in coal mines and in a number of metal mines. Flame safety lamp are used by supervisory staff in underground coal mines for detection of methane gas.
A flame safety lamp provides light in a mine without danger of igniting flammable gases and  in the hands of trained workers, it is also a handy and a very convenient device of detecting the presence as well as percentage of firedamp.
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