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A safety lamp has to ensure that the triangle of fire is maintained inside the lamp, but cannot pass to the outside. Since any breathable atmosphere contains oxygen, and a safety lamp's raison d'être is to operate in an atmosphere also containing fuel (firedamp or coal dust), the element which must be blocked is heat. The key to manufacturing ...
A type of Davy lamp with apertures for gauging flame height. The lamp consists of a wick lamp with the flame enclosed inside a mesh screen. The screen acts as a flame arrestor; air (and any firedamp present) can pass through the mesh freely enough to support combustion, but the holes are too fine to allow a flame to propagate through them and ignite any firedamp outside the mesh.
Stephenson's safety lamp shown with Davy's lamp on the left. The Geordie lamp was a safety lamp for use in flammable atmospheres, invented by George Stephenson in 1815 as a miner's lamp to prevent explosions due to firedamp in coal mines.
The Mammoth Mine disaster or Frick Mine explosion occurred on January 27, 1891 just after 9:00 AM in the Mammoth No. 1 mine in Mount Pleasant Township, Westmoreland County, Pennsylvania. [1] Newspapers reported [ 2 ] that firedamp was ignited by a miner's oil lamp , resulting in the deaths of 109 men and boys.
A Davy lamp, an early example of a safety lamp. The tragedy inspired Hodgson to raise public concern about the hazards of mining. Public interest was fed by a short (16-page) pamphlet written by him and published prior to the second disaster in late 1813.
The Davey Safety Lamp was made in London by Humphry Davy. George Stephenson invented a similar lamp but Davys invention was safer due to it having a fine wire gauze that surrounded the flame. This enabled the light to pass through and reduced the risk of explosion by stopping the "firedamp" methane gas coming in contact with the flame. [1]
The only seam left was the Busty coal. The onsetter, Matthew Elliott, was the only man to have survived from the Busty seam, and his evidence is quoted at length. Critically, he said that the electric lights went out at the time the explosion was heard ("Yes, it was instantaneous"), some time before the cloud was observed by a safety lamp. [26]
Twenty-nine witnesses were called. The evidence indicated that the explosion resulted from defective mine ventilation and the use of naked flames underground, (Note: both the Davy lamp and Geordie lamp safety lamps had been invented in 1815, and widely used in mines at the time) despite warnings having been sent to the mine owner by Mackworth.