Abstract
An instrument is described for obtaining time averages of the resultant of the vertical and one horizontal component of electric field in the lower atmosphere. This instrument is designed to be suspended from a tethered balloon and to telemeter the desired data to an operator by means of an audio pulse width modulation technique which requires the operator to be equipped only with a hand-held AM receiver and a stopwatch. The net self-charge on the field mill is maintained at or near zero by means of a 210Po alpha source. If we assume that the horizontal component of the electric field is small compared with the vertical, the field mill system can be used to observe the average vertical atmospheric electric field profile produced by the electrode effect near the ocean surface.
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