A description is given of balloon-borne proportional counters and circuitry for telemetering and recording cosmic-ray neutron intensities. The preamplifier, amplifier, scaler, and trigger circuit described all use low drain directly heated battery-type tubes. Methods and reasons for pressurization of high voltage circuits are discussed. Included is a description of a multiple-level flight technique using single large plastic balloons for long time intervals at pre-set altitudes.
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Pavalow et al. (1950) studied this question.
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