A Continuously Recording Instrument to Measure Air-Borne Ion Concentration

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Abstract
A vacuum tube electrometer was developed and used in conjunction with portable, shortened concentric cylinder ion collectors which is capable of monitoring ion concentrations in air. The electrometer can operate high impedance recorders which produce a continuous recording of ion levels in ambient air with a time constant of approximately 30 seconds, with proportionally faster response for higher levels of concentration.

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