Safety lamps

L 45 Explosives at coal and other safety-lamp mines... 

Stephenson derived immediate satisfaction from his mechanical accomplishments, there is some evidence that he resented or disdained the public acclaim through his rejection of invitations to join the Royal Society or to accept Knighthood. Despite his brilliance, his relative late education kept him from feeling socially accepted. This may have started with a grudge as early as 1815, when he lost out in a patent dispute with a more privileged rival over a safety lamp that George invented. 

The chronology of the most remarkable contributions to combustion in the early stages of its development is as follows. In 1815, Sir Humphry Davy developed the miner s safety lamp. In 1826, Michael Faraday gave a series of lectures and wrote The Chemical History of Candle. In 1855, Robert Bunsen developed his premixed gas burner and measured flame temperatures and flame speed. Francois-Ernest Mallard and Emile Le Chatelier studied flame propagation and proposed the first flame structure theory in 1883. At the same time, the first evidence of detonation was discovered in 1879-1881 by Marcellin Berthelot and Paul Vieille this was immediately confirmed in 1881 by Mallard and Le Chatelier. In 1899-1905, David Chapman and Emile Jouguet developed the theory of deflagration and detonation and calculated the speed of detonation. In 1900, Paul Vieille provided the physical explanation of detonation... 

It must be remembered that methane can be liberated in a coal mine, not only in the coal itself, but in the nearby stone. It is therefore necessary to use permitted explosives, both in and near a seam of coal. Further, before any shot is fired in a coal mine, tests are made for the presence of methane in the air by means of a safety lamp. This safety lamp is the well-known Davy lamp and an experienced operator can judge the presence of methane in the air from the appearance of the flame. Tests are made... 

Gassy coal mine. A mine in which methane may be present also known as a safety lamp mine. 

Safety lamp mine. Alternative name for gassy mine, implying possible presence of methane. 

Sir Humphry Davy, 1778—1829. English chemist and physicist. One of the founders of electrochemistry. Inventor of die safety lamp for miners. He was the first to isolate potassium, sodium, calcium, barium, strontium, and magnesium. Davy in England and Gay-Lussac and Thenard in France, working independently, were die first to isolate boron. 

Heath and Frost proposed a modification of the miner s safety lamp so that it was possible to use it to heat a small piece of iron to incandescence which could then be touched to the open end of a fuse. This operation was done in such a manner that no flame or spark was produced outside the enclosure of the lamp (Ref 1)... 

Coal Mines, Determination of Firedamp and of Coal Dust In Atmospheres of. Although many instruments have been designed to detect the presence of firedamp (or rather methane) in mine atmospheres, the principles of the flame safety lamp (Davy-type lamp) still form the basis of many detectors. The Davy lamp invented in 1815 is briefly described under COAL MINE EXPLOSIONS AND FIRES and it is stated that each US mine should have at least two Davy-type lamps to serve as detectors of firedamp or of lack of oxygen. If firedamp is present in small quantity, the flame of Davy lamp elongates and if the gas is present in considerable quantity, the lamp becomes filled with blue flame. For more definite detection of gas, the flame of the lamp is lowered until the yel part is at a minimum. Then the gas will be discernible as a small blue cap over the flame. This method is described in Refs 1, 9, 12 25. Some investigators consider that the safety lamp method of detection of firedamp is not very reliable (Ref 7)... 

Corpse Light. It is the blue flame inside the Miner s Safety Lamp, also called Davy Lamp,... 

Davy, Sir Humphry (1778-1829)- An Engl chemist who isolated Na, K, Ba, Ca Sr metals by electrolysis and devised the miner s safety lamp, briefly described in Vol 3, P C362-R, under Coal Mine Explosions and Fires Ref Hackh s (1946), 253-54... 

In 1812 he was knighted by the prince regent for his contributions to electrochemistry, married a wealthy widow Jane Apreece, and was thus able to retire from the Royal Institution at the age of thirty-four, although he remained the director of its laboratory. It was in this capacity that he appointed Michael Faraday as an assistant in the laboratory early in 1813. Later that year with his wife, her maid, and Faraday as an assistant, amanuensis (scribe), and reluctant valet, Davy embarked on an eighteen-month tour of the European continent, visiting many laboratories and sites of natural and cultural interest. On their return, Davy invented, with Faraday s assistance, the miners safety lamp, which reinforced his reputation in applied science. With a confidence that was shared by all romantics of the time, Davy believed that nothing was beyond his reach, and in 1820 he was elected president of the Royal Society The U K. National Royal Society. This was a position he was ill-equipped to undertake after... 

Coal Mines, Determination of Firedamp and of Coal Dust in Atmospheres of. Although many instruments have been designed to detect the presence of firedamp (or rather methane) in mine atmospheres, the principles of the flame safety lamp (Davy-type lamp) still form the basis of many detectors. The Davy lamp invented in 1815 is briefly described under... 

Flame safety lamp as a detector for firedamp) 10)W.M-Schweickart, USP 2195842 (1940) CA 34, 5275 ( 1940) (App for empirical detnof dust in bituminous coal mines) 10a)J.Formanek, H ornikyVestnik 22,... 

For lighters, sparking toys, industrial torches and miner s safety lamps... 

Chlorine bleach is developed by Claude Louis BerthoUet in France Alessandro Volta makes a Copper/Zinc acid battery Humphry Davy invents a safety lamp that is used in coal mines without triggering an explosion... 

Describe a miner s safety lamp, and state the exact principle on which its use depends. 

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