This video from Periodic videos shows how Davy's lamp was built. It was designed to have a lit lamp in a methane atmosphere without an explosion. Methane is a colorless and odorless flammable gas that is often present in coal mine. The metal gauze prevents the flame from escaping the lamp. The lamps color will change to blue in the presence of methane alerting the coal miner of the need to exit the area.
http://www.youtube.com/watch?v=w0-07rnvUxM&feature=autoplay&list=UUtESv1e7ntJaLJYKIO1FoYw&playnext=1
Natural gas in homes and laboratories has a mercaptan compound added with an odor that allows detection.
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