damp

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damp

damp, in mining, any mixture of gases in an underground mine, especially oxygen-deficient or noxious gases. The term damp probably is derived from the German dampf, meaning fog or vapor. Several distinct types of damp are recognized. Firedamp is methane and other flammable gases, often mixed with air; it results from the decomposition of coal or other carbonaceous materials. Explosive mixtures of firedamp with air usually contain from 1% to 14% methane. The mixture of gases that remains after a firedamp explosion is called afterdamp; it consists chiefly of carbon dioxide and nitrogen. Chokedamp is any mixture of oxygen-deficient mine gases that causes suffocation. (In England, carbon dioxide is called chokedamp.) Several methods are used for detection of damps. The Davy safety lamp is one of the earliest detection devices. The color and height of the lamp flame indicate the amount of firedamp present; if the flame is extinguished, chokedamp is present. Canaries were formerly kept in mines; the birds are overcome by relatively small quantities of noxious gases, and their death warned the miners of the presence of damps. Special colorimetric detectors are now used. The methanometer is a special portable instrument used to detect firedamp.
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damp

[damp]
(engineering)
To reduce the fire in a boiler or a furnace by putting a layer of damp coals or ashes on the fire bed.
(mining engineering)
A poisonous gas in a coal mine.
(physics)
To gradually diminish the amplitude of a vibration or oscillation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
His companions rode away and he and Richard Penderel hid damply in a wood for the day.
Grey clouds passed across the sky, but all so thick--and then the mist rolled up and moved damply, heavily through the undergrowth, so idly, so stupidly.
LARKHILL'S conditions were damply mirrored at the other meeting, which opened with a return-to-the-saddle win (first since 1990) for ex-trainer Steve Campion when 20-1 shot Eve's Treasure comfortably accounted for the favourite, Give It A Whirl, in the members'.
A more sentimental one would have editorialized, damply, over the loss of so talented a young man.
We could then grope damply down my candle-lit hallway to fall, enmeshed, into clean sheets.
The Mondale-Ferraro campaign is sputtering damply in California.