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A version of the catalytic methanometer with the addition of improved
detector elements. Platinum may be used as the filament that both heats
the detecting element and acts simultaneously as a resistance type
thermometer. Gas is drawn through the instrument by a rubber suction bulb,
and the filaments are heated from a dry battery of the mercury type
contained in the apparatus. Readings of methane concentration can be taken
on the built-in electrical meter. Nelson
Source:
Dictionary of Mining, Mineral, and Related Terms
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