The sensitivity of the hot-filament ionization gauge is in good agreement with theoretical values calculated on the basis of a physical picture of a stream of electrons passing to and fro through the ionizing space. The calibration curve is not exactly linear, the sensitivity decreasing as the pressure increases from 10 -4 to 10 -3 mm of mercury. The tungsten filament in such a gauge "pumps" oxygen at a rate which is in agreement with earlier work of Langmuir. The remanent molecules which determine the ultimate pressures of diffusion pumps are strongly adsorbed by the gauge, which behaves as a pump of constant speed S . An account of the nature of this phenomenon is given.
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Lynn M. Riddiford (1951) studied this question.
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