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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.
It depicts the scientist Sir Humphry Davy, president of the Royal Society. Davy is known for the invention of the Davy Lamp and isolating a number of elements using electricity. It shows Davy in the stance of a swagger portrait dressed in fashionable Regency era style. [1] A Davy Lamp sits on the table next to him.
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.
A Davy lamp. In the Davy lamp a standard oil lamp is surrounded by fine wire mesh or gauze, the top being closed by a double layer of gauze. If firedamp is drawn into the flame it will burn more brightly and if the proportions are correct may even detonate. The flame on reaching the gauze fails to pass through and so the mine atmosphere is not ...
[4] [a] Later on, Stephenson adopted Davy's gauze to surround the lamp (instead of the perforated metal tube) and the intake tubes were changed to holes or a gallery at the base of the lamp. It was this revised design that was used for most of the 19th century as the Geordie lamp.
In a carbon arc lamp, the electrodes are carbon rods in free air. To ignite the lamp, the rods are touched together, thus allowing a relatively low voltage to strike the arc. [1] The rods are then slowly drawn apart, and electric current heats and maintains an arc across the gap. The tips of the carbon rods are heated and the carbon vaporizes. [1]
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Davy may refer to: Davy (given name) Davy (surname) Davy lamp, a type of safety lamp with its flame encased inside a mesh screen; Davy, West Virginia, United States, a town; Davy Sound, Greenland; Davy (crater), a crater on the Moon; Davy, a post-apocalyptic science fiction novel by Edgar Pangborn