This methane recorder is a combination of the principles used in the Ringrose
and McLuckie detectors. Two combustion chambers are used, each of which
operates every 6 min, the operation being staggered so that 20 determinations
are made per hour. Samples are drawn into the instrument by means of an
electrically driven pump, the operation of the pump and the combustion
filaments being controlled by cams on a shaft driven by the motor. Pressures
are measured by an aneroid cell and recorded on a clockwork driven drum. Roberts,
1
Source: Dictionary of Mining, Mineral, and Related Terms
