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	Kids.Net.Au - Encyclopedia > Davy lamp
		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).
	www.kids.net.au /encyclopedia-wiki/da/Davy_lamp (224 words)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal
		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].
	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=Davy_lamp (523 words)

	Fathom :: The Source for Online Learning
		Davy was well aware that in certain circumstances, such as a strong current of firedamp, his lamp could be unsafe and he himself suggested some modifications.
		The Davy lamp was widely adopted and over the years many modifications and improvements were made.
		In practice Davy's lamp was far more significant because it was his understanding of the scientific principles and application of the wire gauze that was so valuable and which formed the basis for the design of virtually all flame safety lamps.
	www.fathom.com /feature/122235/index.html (981 words)

	Sir Humphry Davy: the invention of the Davy safety lamp
		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)...
		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.
		Davy's much-publicized invention was important in the progression of the industrial revolution, giving strong evidence that science could be used to overcome an increasing number of modern problems.
	www.manhattanrarebooks-science.com /davy.htm (529 words)

	Davy lamp
		The lamp was invented by Sir Humphry Davy in 1816.
		It consisted of a glass cylinder, within which the flame was further encased in wire gauze so as to permit air to enter but prevent the flame escaping to ignite any inflammable gases which might be present in the mine air.
		Davy’s invention has stood the test of time and has been the means of saving innumerable lives.
	www.staffspasttrack.org.uk /exhibit/coal/safetyandrescue/davylamp.htm (88 words)

	cap lamp,LED safety lamp,mineral lamp,cap lamp,miner's lamp,safety cap lamps,Li-ion battery,battery,batteries,Li-ion ...
		Rechargez la commande avec chaque lampe par tension et prélèvement courant, et rivalisez avec la tension, commutez intelligemment, récupérez automatiquement le court circuit.
		Avec des données automatiquement d'échantillonnage, il s'assure chaque lampe seulement quand extension une estimation stable puis dans le courant constant, commutateur constant de tension automatiquement.
		LED lamp, Davy Lamp, Clanny Lamp, Stephenson Lamp, Mueseler Lamp, Marsaut Lamp, Shielded Lamps, Evan-Thomas Lamp, Morgan Lamp, Clifford Lamp, Protector Lamp, A. Lamp, Uses of the Safety-Lamp, Pieler Lamp, Clowes Hydrogen Lamp, Lamp-room, Electric Lamps etc
	www.caplamp.org /fr.htm (882 words)

	Davy lamp Summary
		Davy was asked to help by a society that had been formed to prevent coal-mine accidents.
		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.
		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).
	www.bookrags.com /Davy_lamp (847 words)

	Miners' Davy Lamp and Carbide Lamp
		The Davy lamp was fuelled by oil or naptha (lighter fluid), and the wick was contained in a metal gauze cylinder.
		If the lamp is placed in an explosive atmosphere, such as a mixture of air and methane gas as commonly found in a coal mine, the explosion that takes place when the flame contacts the gas is contained within the gauze mesh and does not cause a danger to the miners.
		A picture of a Davy lamp is incorporated in the Lindal and Marton Primary School LAMPS logo, in recognition of the school's mining heritage.
	www.lindal-in-furness.co.uk /MinersLamps/minerslamps.htm (830 words)

	Davy lamp - Encyclopedia, History, Geography and Biography
		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 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].
		The modern day equivalent of the Davy lamp is the Protector GR6S Garforth lamp which is used for firedamp testing in all UK coal mines.A modified version of this lamp is used to transport the Olympic Flame for the torch relays.
	www.arikah.com /encyclopedia/Davy_lamp (611 words)

	Davy lamp
		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).
	www.ebroadcast.com.au /lookup/encyclopedia/da/Davy_lamp.html (199 words)

	Safety-Lamp - LoveToKnow 1911
		In 1816 Sir Humphry Davy discovered the suitability of wire gauze as the material of the metal case, when the substance of the wire was rightly proportioned to the size of the aperture.
		This is one of the safest forms of lamp, but requires considerable care in use, especially in keeping the small feed holes clear from dust and oil; the glass protects the gauze from becoming overheated, and when the air is dangerously charged with gas the light is extinguished.
		The safety of the Davy lamp is endangered by exposure to a current of gas moving at more than 6 ft. a second, as the flame is then liable to be forced through the gauze, and the Clanny and Stephenson lamps are not safe in currents exceeding 8 and io ft. respectively.
	www.1911encyclopedia.org /Safety-Lamp (1368 words)

	Davy
		Davy fully realised that without any shield his single gauze lamp would allow the passage of flame to the external atmosphere if the velocity of the explosive atmosphere reached about 300 feet per minute.
		Great progress was made in the design of safety lamps from 1816 onwards and it is remarkable that the Davy lamp was still commonly used in the early part of the twentieth century.
		The Davy lamp was quickly adapted in Belgium France and Germany and as early as 1818 an official instruction was issued in Belgium regarding the use of the Davy lamp.
	www.mininginstitute.org.uk /lamps/Davy.html (1366 words)

	Safety Lamp History
		In 1815, Davy discovered that if two vessels were filled with explosive gas, they might be connected together by a narrow tube, and the gas in one of the chambers could be exploded without transmitting the explosion to the adjoining chamber.
		Davy's wire gauze principle was used in almost every type of flame safety lamp that was developed for near 200 years.
		Stephenson's third lamp was a success, and with modifications was successfully used in coal mines mainly in the North of England.
	www.minerslamps.net /homepage/safetylamphistory.htm (739 words)

	Davy lamp - Wikipedia, the free encyclopedia
		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].
		The modern day equivalent of the Davy lamp is the Protector GR6S Garforth lamp which is used for firedamp testing in all UK coal mines.
		A modified version of this lamp is used to transport the Olympic Flame for the torch relays.
	en.wikipedia.org /wiki/Davy_lamp (581 words)

	Who Invented the Flame Safety Lamp
		The invention of the flame safety lamp is often attributed to Sir Humphrey Davy, the renowned Cornish scientist and scholar.
		Clanny's first lamp, which he developed in 1813 and presented to the Royal Society in a lecture, used a water trap at the inlet and outlet to the lamp, and a set of bellows was used to force air through the lamp to keep the flame alight.
		Stephenson's lamp protected the general body of mine air from the enclosed flame with both narrow tubes and a perforated metal screen, the latter having much the same effect as the wire gauzes subsequently used by Davy.
	www3.telus.net /~pcain/Lamps/invent.html (709 words)

	Humphry Davy
		Humphry Davy (1778–1829), son of an impoverished Cornish woodcarver, rose meteorically to become a leader in the reformed chemistry movement initiated by Antoine-Laurent Lavoisier—albeit a critic of some of its basic premises—and a pioneer in the new field of electrochemistry.
		Davy's recognition that the alkalis and alkaline earths were all oxides challenged Lavoisier's theory that oxygen was the principle of acidity.
		Davy became a fellow of the Royal Society in 1803 and served as its president from 1820 to 1827.
	www.chemheritage.org /classroom/chemach/electrochem/davy.html (576 words)

	Welsh miners cambrian flame safety brass lamps
		The Royal Commissioners, however, finally decided in favor of four lamps, 'in which the quality of safety, in a preeminent degree, is combined with simplicity of construction, and with illuminating power at least fully equal to that of the lamps hitherto in general use.
		Sir Humphrey Davy stated, as the result of protracted experiments, that 'when a cylindrical gauze is used, it should not be more than 2 inches in diameter, for a larger cylinder the combustion of the firedamp renders the top inconveniently hot'.
		Davy restricted the height of his gauze to 7 inches; in the 'Scotch Davy' the height was 10 inches, exclusive of cap or top.
	www.welshminerslamps.com /info_lamp_history.shtml (2510 words)

	MineLighting
		Miners' oilwick cap lamps were used in the U.S. from the 1860s into the early 1920s, with the first patent for a miners' oilwick lamp granted on May 13, 1862 and the last patent granted on Apr. 20, 1915.
		Driver’s lamps were the larger lamps worn by mule drivers and others working in the drifts where more light was needed and where a greater chance of the air currents extinguishing a smaller flame existed.
		Hand lamps never became popular with coal miners due to their higher cost and inability to provide focused light at the working face, they were used more extensively in the western hard rock mines.
	www.kycoal.homestead.com /MineLighting.html (822 words)

	Davy lamp: Definition and Links by Encyclopedian.com
		...Davy lamp Davy lamp In 1815 Humphry Davy devised a safety lamp for use in coal...first trial of a Davy lamp with a wire sieve was at Hebburn-Colliery Hebburn Colliery Hebburn...a wire sieve was at Hebburn-Colliery Hebburn Colliery Hebburn Colliery on January 9, 1816.
		...by Sir Humphry Davy in the early 19th century (1802, 1805, 1807 and 1809 are all mentioned),...to produce the lamps commercially after 1850 but the lack of a constant mains electricity...
		He had discovered that, to explode, the gas must be heated to its ignition temperature and that if such heating is prevented combustion cannot occur.
	www.encyclopedian.com /da/Davy-lamp.html (375 words)

	Brush's Arc Lamp
		The upward movement of the upper carbon electrode establishes a gap and the arc of the lamp is "struck".
		This lamp was probably designed primarily for indoor applications (several appear in an illustration of the interior of a Brush central station).
		This style of lamp was housed in a decorative frame with a hood as depicted in the drawing of a double-carbon lamp at the left.
	www.lafavre.us /brush/lamparc.htm (2739 words)

	Davy (Site not responding. Last check: )
		Davy is best remembered for his contributions to the understanding of electrochemistry and for his invention of a safety lamp for miners.
		Davy utilized the reducing power of potassium to prepare boron, and he developed the method of separating potassium from sodium based upon the insolubility of potassium perchlorate and the solubility of sodium perchlorate in 97% alcohol.
		Davy's health was by then failing rapidly; in 1827 he departed for Europe and, in the summer, was forced to resign the presidency of the Royal Society, being succeeded by Davies Gilbert.
	chem.ch.huji.ac.il /~eugeniik/history/davy.htm (3282 words)

	minesafetylamps
		The danger of methane gas (firedamp) being ignited by an open flame in coal mines was much reduced by the development of the flame safety lamp stemming from the work of Dr. William Clanny, George Stephenson and Sir Humphrey Davy.
		It is Davy who is credited with the true invention of the flame safety lamp in 1816.
		Davy demonstrated that burning gases, on passing through the wire mesh is broken up into tiny streamlets which are so cooled by contact with the metal of the mesh that the flame is extinguished.
	miningartifacts.homestead.com /minesafetylamps~ns4.html (138 words)

	19 Potassium
		Davy was born in Penzance in 1778 the son of a woodcarver.
		By the age of 24 Davy was a professor of chemistry at the Royal Institution.
		Davy is remembered now for his work on the miners safety lamp which bears his name, but perhaps his greatest contribution to science was the encouragement he gave to the young Michael Faraday.
	www.vanderkrogt.net /elements/elem/k.html (886 words)

	Davy lamp definition - Dictionary - MSN Encarta
		Davy lamp definition - Dictionary - MSN Encarta
		Search for "Davy lamp" in all of MSN Encarta
		U.K. miners' lamp: a portable oil-burning lamp, formerly used by miners, in which the flame is protected by metal gauze to prevent it from igniting explosive gases underground
	encarta.msn.com /encnet/features/dictionary/DictionaryResults.aspx?refid=1861671202 (65 words)

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