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Encyclopedia > Davy lamp
Davy lamp
Davy lamp

The Davy lamp is a candle containing safety lamp devised in 1815 by Humphry Davy. It was created for use in coal mines, allowing deep seams to be mined despite the presence of methane and other flammable gases, called firedamp or minedamp. Image File history File links Download high resolution version (491x640, 128 KB) Description: en:Davy lamp (safety lamp for use in coal mines) Source: Bibliothek allgemeinen und praktischen Wissens für Militäranwärter Band III, 1905 / Deutsches Verlaghaus Bong & Co Berlin * Leipzig * Wien * Stuttgart Author: Scan made by Kogo... Image File history File links Download high resolution version (491x640, 128 KB) Description: en:Davy lamp (safety lamp for use in coal mines) Source: Bibliothek allgemeinen und praktischen Wissens für Militäranwärter Band III, 1905 / Deutsches Verlaghaus Bong & Co Berlin * Leipzig * Wien * Stuttgart Author: Scan made by Kogo... Safety lamp is the name of a variety of lamps for safety in coal-mines against coal dust, methane, or firedamp, a highly explosive mixture of natural gas apt to accumulate in them. ... The Battle of New Orleans 1815 was a common year starting on Sunday (see link for calendar). ... Sir Humphry Davy. ... Wyoming coal mine Coal mining is the mining of coal. ... The simplest hydrocarbon, methane, is a gas with a chemical formula of CH4. ... A gas is one of the four main phases of matter (after solid and liquid, and followed by plasma), that subsequently appear as a solid material is subjected to increasingly higher temperatures. ... Firedamp is a flammable gas found in coal mines. ...


Davy had discovered that, to explode, the gas must be heated to its ignition temperature and that if such heating is prevented, combustion cannot occur. If the flame in a lamp is surrounded by metal gauze to distribute the heat over a large area, the maximum temperature of the screen is below the ignition temperature of the gas. The first trial of a Davy lamp with a wire sieve was at Hebburn Colliery on 9 January 1816. Gasoline explosions, simulating bomb drops at an airshow. ... Ignition occurs when the heat produced by a reaction becomes sufficient to sustain the reaction, whether it be a fire, an explosion, or nuclear fusion. ... For the Japanese Hardcore Punk Band, see Gauze. ... Hebburn is a small town situated on the south bank of the River Tyne in North East England, sandwiched between the towns of Jarrow and Gateshead. ... January 9 is the 9th day of the year in the Gregorian calendar. ... 1816 was a leap year starting on Monday (see link for calendar). ...


The lamp also provided a crude test for the presence of gases. If inflammable gas mixtures were present, the flame of the Davy lamp burned higher with a blue tinge. Miners could also place a safety lamp close to the ground to detect gases, such as carbon dioxide, that are denser than air and so could collect in depressions in the mine, if the mine air was oxygen-poor, the lamp flame would be extinguished (chokedamp). Carbon dioxide is an atmospheric gas comprised of one carbon and two oxygen atoms. ...


There was some controversy, since George Stephenson also produced a similar safety lamp, called the Geordie lamp in 1815. George Stephenson George Stephenson (9 June 1781 – 12 August 1848) was an English mechanical engineer who designed a famous and historically important steam-powered locomotive named Rocket and is known as the Father of British Steam Railways. The Victorians considered him a great example of diligent application and thirst for... The Geordie lamp was invented by George Stephenson in 1815 as a solution to explosions due to firedamp in coal mines. ... The Battle of New Orleans 1815 was a common year starting on Sunday (see link for calendar). ...


How far the difference was appreciated at the time is hard to say; supporters of both men seem to have regarded the other as having copied their man’s idea and copied it wrongly. The Stephenson lamp (with no gauze around the flame) gave a brighter light and was popular with the pitmen. The Davy lamp was simpler and cheaper to make and was popular with the mineowners. To meet Wikipedias quality standards, this article or section may require cleanup. ...


There were supposed safety arguments on both sides: in principle, a poorly maintained (or badly designed) Davy lamp could overheat the gauze if it met a high concentration of methane. A more serious objection to the Stephenson lamp was that it stopped being a safety lamp if the glass was broken. In the long term, the Davy lamp (or at least the principle of a gauze enclosure round the flame) won out.


The introduction of the Davy lamp actually led to an increase in accidents in mines as the availability of the lamp encouraged the working of mines that had previously been closed for safety reasons. [1]


See also

L i g h t i n g   and   L a m p s
Incandescent: Conventional - Halogen - Parabolic Aluminized Reflector (PAR) Compact fluorescent lightbulb
Fluorescent: Compact Fluorescent (CFL) - Linear fluorescent
Gas discharge:  High-Intensity Discharge (HID) - Mercury-vapor - Metal-halide - Neon - Sodium vapor
Electric arc: Arc lamp - HMI - Xenon arc - Yablochkov candle
Combustion: Acetylene/Carbide - Candle - Gas lighting - Kerosene lamp - Limelight - Oil lamp
Other types: Induction lamp - Light-Emitting Diode (LED) - Fiber optics - Plasma - Safety lamp

  Results from FactBites:
 
Kids.Net.Au - Encyclopedia > Davy lamp (224 words)
In 1815 Humphry Davy devised a safety lamp for use in coal mines, allowing deep seams to be mined despite the presence of methane and other flammable gases, called firedamp[?] or minedamp.
The first trial of a Davy lamp with a wire sieve was at Hebburn Colliery[?] on January 9, 1816.
Miners could also place a safety lamp close to the ground to detect gases, such as carbon dioxide, that are denser than air and so could collect in depressions in the mine, if the mine air was oxygen-poor, the lamp flame would be extinguished (chokedamp).
Spartanburg SC | GoUpstate.com | Spartanburg Herald-Journal (523 words)
Davy had discovered that, to explode, the gas must be heated to its ignition temperature and that if such heating is prevented, combustion cannot occur.
The first trial of a Davy lamp with a wire sieve was at Hebburn Colliery on 9 January 1816.
The introduction of the Davy lamp actually led to an increase in accidents in mines as the availability of the lamp encouraged the working of mines that had previously been closed for safety reasons [1].
  More results at FactBites »

 
 

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