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 Other gas-detecting devices are now more commonly used, e.g., the methanometer; as a light source the Davy lamp has been replaced by electric lighting.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 ?
Beamish's Mahogany Drift Mine carried out its last gas test with a safety lamp last year, after the introduction of new mines regulations meant all testing has to be carried out using electronic detectors.
Returning to medicine, with Dr Helot of Rouen, he developed a lightweight battery-powered forehead lamp, the 'photophore', for surgeons and dentists, then a portable electric safety lamp for miners, firemen and underwater divers in the Suez Canal.
In addition to the self-extinguishing feature, the Woodhead Safety Lamp includes an arc tube shield to protect workers from injury due to falling hot glass.
Science history expert Richard Ellam will give his own demonstration on how to invent a safety lamp at 10am, 11.
Wolf Safety Lamp Company's new ATEX approved Wolflite XT Handlamp incorporates the latest LED technology, and delivers 200 Lumens output on full power, an increase of five times the light output from the previous Wolf H-251A Handlamp.
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?
ALL OVER: Safety lamp held aloft after last shift, miner leaves locker room for final time, above, and Alan, right; ANGER: Protest at closure
When he died in 1868 aged 67, he had managed to invent a safety lamp which helped reduce the number of accidents in coal mines; he'd created the world's first public railway; and created the infamous Rocket.