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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.
Rimmer, D & others Clanny, Stephenson and Davy: commemorating the bicentenary of the miners safety lamps. Miners Lamp Collectors Society, 2015; Watson, W.F. The invention of the miners safety lamp: a reappraisal Transactions, Newcomen Society 70(1) 1998-9, 135-141 "to settle the disputed features of the lamps of Clanny, Davy and Stephenson"
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 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.
Durham Mining Museum (2012), Mill Pit, Herrington; E. Thomas & Williams Ltd, Original Types of Miners' Flame Safety Lamps, Welshminerslamps.com; Knight, David (1992), Humphry Davy: Science and Power, Cambridge University Press, ISBN 978-0-631-16816-4
Firedamp (1889) by Constantin Meunier depicts the aftermath of a mining disaster Stephenson's safety lamp shown with Davy's lamp on the left. Firedamp is explosive at concentrations between 4% and 16%, with most explosions occurring at around 10%. It caused many deaths in coal mines before the invention of the Geordie lamp and Davy lamp. [4]
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