safety lamp


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safety lamp,

oil lamp designed for safe use in mines and other places where flammable gases such as firedamp (see dampdamp,
in mining, any mixture of gases in an underground mine, especially oxygen-deficient or noxious gases. The term damp probably is derived from the German dampf, meaning fog or vapor. Several distinct types of damp are recognized.
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) may be present. Its invention (c.1816) is usually attributed to Sir Humphry Davy. The Davy lamp is based upon the principle that to be ignited a substance must first be heated to its kindling temperature and that if such heating is prevented combustion will not occur. The flame in the lamp is surrounded by a metal-gauze screen that distributes the heat over a large area so that the maximum temperature of the screen is below the ignition temperature of the flammable gas mixture (e.g., firedamp). Improvements devised by K. G. Bischof and others include special locks to prevent the accidental opening of the lamp and devices to permit the lamp to be held upside down without danger. If firedamp or related gas mixtures are present in a mine, the Davy lamp flame burns higher and with a blue halo; the height of the flame and color of the halo indicate the amount of combustible gas in the air. If the mine air is deficient in oxygen, the lamp flame is extinguished. Coal miners often placed the safety lamp close to the ground to detect gases, e.g., carbon dioxide, that are denser than air and thus collect in poorly ventilated depressions in the mine. Other gas-detecting devices are now more commonly used, e.g., the methanometer; as a light source the Davy lamp has been replaced by electric lighting.

safety lamp

[′sāf·tē ‚lamp]
(mining engineering)
In coal mining, a lamp that is relatively safe to use in atmospheres which may contain flammable gas.
References in periodicals archive ?
The stolen items include a ship's telegraph, a binnacle with compass, a ship's walker log, a bilge pump, a light starboard, a ship's two sleeved wooden block, a submarine safety lamp, a brass fishing float, an 8-inch gimbal ship's candle lamp, a 12-inch bronze cleat, a 14-inch four sided ship's lamp, two iron bellying pins and a wooden bottle with brass rings.
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A clever blue Livetool safety lamp indicates the tool is active when plugged in.
THE MINERS' SAFETY LAMP is an icon of the Industrial Revolution every bit as powerful as Stephenson's Rocket or the Iron Bridge at Coalbrookdale.
My query is, do the lamps made in Taiwan require the British Safety Standards mark, as a miner's flame safety lamp is a scientific apparatus, designed with special safety glass, wire gauge etc?
Just One Spark, which takes place during half term from February 13-21, charts the historic race to invent a miners' safety lamp in the North East.
Stephenson's safety lamp was demonstrated a month before the eminent scientist Humphry Davy demonstrated his very different lamp to the Royal Society.
WOLF SAFETY LAMP COMPANY's all-new ATEX approved Wolflite XT Handlamp, represents the most significant Safety Handlamp development for over 25 years.
1778: Sir Humphrey Davy, chemist and inventor of the miner's safety lamp, was born in Penzance.
Davy, who was knighted in 1812 and made a baronet in 1818, pioneered electrochemistry but is perhaps best known for inventing the Davy safety lamp for miners.